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Home Q & A Board Science-Related Homework Help Physics Astronomy
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Evolution can occur only if there is some random variation.
Evolution can occur only if there is some random variation.
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Evolution can occur only if there is some random variation.

▸ true

▸ false[/ht
pattytcakes   90   1 Reply
2 months ago
____________ is often referred to as the "universal solvent."
____________ is often referred to as the "universal solvent."

____________ is often referred to as the "universal solvent."
mickied   86   1 Reply
2 months ago
Why do some scientists think that the idea of the habitable zone as a fixed distance range from a ...
Why do some scientists think that the idea of the habitable zone as a fixed distance range from a ...
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Why do some scientists think that the idea of the habitable zone as a fixed distance
aznhermit101   82   1 Reply
2 months ago
Why do scientists no longer think that complex organic molecules must have first formed in shallow pools?
Why do scientists no longer think that complex organic molecules must have first formed in shallow pools?
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Why do scientists no longer think that complex organic molecules must have first for
Sammyjoe1105   133   1 Reply
2 months ago
Why do scientists consider it to be very unlikely that UFO reports are due to visitors from another ...
Why do scientists consider it to be very unlikely that UFO reports are due to visitors from another ...
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Why do scientists consider it to be very unlikely that UFO reports are due to visito
sperry263   83   1 Reply
2 months ago
Who is the intended recipient of the Arecibo message?
Who is the intended recipient of the Arecibo message?
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Who is the intended recipient of the Arecibo message?

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badd99   43   1 Reply
2 months ago
Which of the following star systems would be the best place to search for planets that could host life?
Which of the following star systems would be the best place to search for planets that could host life?
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Which of the following star systems would be the best place to search for planets th
SeaBass2013   61   1 Reply
2 months ago
Which of the following lists events in the order that they occurred?
Which of the following lists events in the order that they occurred?
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Which of the following lists events in the order that they occurred?

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arunasingh5   40   1 Reply
2 months ago
Which of the following limits the number of technological civilizations in our galaxy?
Which of the following limits the number of technological civilizations in our galaxy?
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Which of the following limits the number of technological civilizations in our galax
karotop02   42   1 Reply
2 months ago
Which of the following is used by all known forms of life on Earth as a medium for chemical reactions?
Which of the following is used by all known forms of life on Earth as a medium for chemical reactions?
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Which of the following is used by all known forms of life on Earth as a medium for c
Cell6   54   1 Reply
2 months ago
Which of the following is a segment of a chromosome that controls a specific function?
Which of the following is a segment of a chromosome that controls a specific function?
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Which of the following is a segment of a chromosome that controls a specific functio
marcsleiman   45   1 Reply
2 months ago
Which of the following best describes a mutation?
Which of the following best describes a mutation?
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Which of the following best describes a mutation?

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citycyborg   46   1 Reply
2 months ago
Which of the choices below sorts the solar system locations from most-to-least likely for life to develop?
Which of the choices below sorts the solar system locations from most-to-least likely for life to develop?
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Which of the choices below sorts the solar system locations from most-to-least likel
itshammertime   144   1 Reply
2 months ago
When did the first single-celled organisms evolve on Earth?
When did the first single-celled organisms evolve on Earth?
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When did the first single-celled organisms evolve on Earth?

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Coolguy80   47   1 Reply
2 months ago
When considering the possible number of technologically advanced civilizations in our galaxy, which ...
When considering the possible number of technologically advanced civilizations in our galaxy, which ...
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When considering the possible number of technologically advanced civilizations in ou
JSmith1   63   1 Reply
2 months ago
What wavelengths are used in current searches for extraterrestrial intelligence by radio telescopes?
What wavelengths are used in current searches for extraterrestrial intelligence by radio telescopes?
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What wavelengths are used in current searches for extraterrestrial intelligence by r
jadelga3   42   1 Reply
2 months ago
What was happening elsewhere in the universe when the first complex life appeared on Earth?
What was happening elsewhere in the universe when the first complex life appeared on Earth?
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What was happening elsewhere in the universe when the first complex life appeared on
tootsiebrowny   47   1 Reply
2 months ago
What is the most important reason why scientists do NOT believe Earth has ever been visited by alien ...
What is the most important reason why scientists do NOT believe Earth has ever been visited by alien ...
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What is the most important reason why scientists do NOT believe Earth has ever been
sarasmith06   73   1 Reply
2 months ago
What is "the habitable zone"?
What is "the habitable zone"?
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What is "the habitable zone"?

▸
nurse15   41   1 Reply
2 months ago
What happens to a star's habitable zone as the star ages?
What happens to a star's habitable zone as the star ages?
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What happens to a star's habitable zone as the star ages?

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blakenordgaard   34   1 Reply
2 months ago
What does the Drake equation tell us about life in the universe?
What does the Drake equation tell us about life in the universe?
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What does the Drake equation tell us about life in the universe?

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Chocolate_Pie   52   1 Reply
2 months ago
What do DNA molecules contain the patterns for?
What do DNA molecules contain the patterns for?
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What do DNA molecules contain the patterns for?

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meghan.binge   40   1 Reply
2 months ago
What did the Miller-Urey experiment create?
What did the Miller-Urey experiment create?
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What did the Miller-Urey experiment create?

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nitanikollaj   45   1 Reply
2 months ago
What are believed to have been the best places for life to have formed on Earth?
What are believed to have been the best places for life to have formed on Earth?
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What are believed to have been the best places for life to have formed on Earth?
sweetapple718   40   1 Reply
2 months ago
The first complex life appeared on Earth about 0.5 billion years ago. What period was that?
The first complex life appeared on Earth about 0.5 billion years ago. What period was that?
[html]The first complex life appeared on Earth about 0.5 billion years ago. What period was that?


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nsdq007   54   1 Reply
2 months ago
Suppose you wanted to use your radio telescope to search for signals from alien civilizations. Which ...
Suppose you wanted to use your radio telescope to search for signals from alien civilizations. Which ...
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Suppose you wanted to use your radio telescope to search for signals from alien civi
Bpringle2000   72   1 Reply
2 months ago
Suppose that SETI researchers discovered a radio signal coming from a star in the direction of the ...
Suppose that SETI researchers discovered a radio signal coming from a star in the direction of the ...
[html]

Suppose that SETI researchers discovered a radio signal coming from a star in the di
hussainizzle   56   1 Reply
2 months ago
Suppose that a lifeform was discovered on Mars, and all of the different individuals in this ...
Suppose that a lifeform was discovered on Mars, and all of the different individuals in this ...
[html]

Suppose that a lifeform was discovered on Mars, and all of the different individuals
Rosa   42   1 Reply
2 months ago
Presuming that it takes a few billion years for complex life to evolve in a stable environment, what ...
Presuming that it takes a few billion years for complex life to evolve in a stable environment, what ...
[html]

Presuming that it takes a few billion years for complex life to evolve in a stable e
xiaoyu000   86   1 Reply
2 months ago
In the Drake equation, when considering the possible number of technologically advanced ...
In the Drake equation, when considering the possible number of technologically advanced ...
[html]

In the Drake equation, when considering the possible number of technologically advan
texasmade2550   45   1 Reply
2 months ago
If you uncoiled and stretched out all of the DNA molecules in a typical human, what would their ...
If you uncoiled and stretched out all of the DNA molecules in a typical human, what would their ...
[html]

If you uncoiled and stretched out all of the DNA molecules in a typical human, what
mb83   48   1 Reply
2 months ago
How is DNA important to a cell?
How is DNA important to a cell?
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How is DNA important to a cell?

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tw1gg   50   1 Reply
2 months ago
How do we usually refer to deoxyribonucleic acid?
How do we usually refer to deoxyribonucleic acid?
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How do we usually refer to deoxyribonucleic acid?

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Bpringle2000   42   1 Reply
2 months ago
DNA is coiled into a tight spiral and makes up the genetic material in a cell. What is that material ...
DNA is coiled into a tight spiral and makes up the genetic material in a cell. What is that material ...
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DNA is coiled into a tight spiral and makes up the genetic material in a cell. What
vanessavz   71   1 Reply
2 months ago
What is ALH 84001, and why are most scientists skeptical about the extraordinary claims that have ...
What is ALH 84001, and why are most scientists skeptical about the extraordinary claims that have ...
[html]

What is ALH 84001, and why are most scientists skeptical about the extraordinary cla
killerbear900   60   1 Reply
2 months ago
What information would you include in a signal to be sent to the possible inhabitants of TRAPPIST-1?
What information would you include in a signal to be sent to the possible inhabitants of TRAPPIST-1?
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What information would you include in a signal to be sent to the possible inhabitant
arpylzr75   45   1 Reply
2 months ago
What did Butler mean when he said, "The chicken is the egg's way of making another egg"?
What did Butler mean when he said, "The chicken is the egg's way of making another egg"?
[html]

What did Butler mean when he said, "The chicken is the egg's way of making another e
lpn27   41   1 Reply
2 months ago
What are the key properties of living things?
What are the key properties of living things?

What are the key properties of living things?
yosie   40   1 Reply
2 months ago
In searching for other life in the universe, why does it make sense to look for planets with liquid water?
In searching for other life in the universe, why does it make sense to look for planets with liquid water?
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In searching for other life in the universe, why does it make sense to look for plan
Krispylynn33   135   1 Reply
2 months ago
If life exists somewhere else in the universe, why is it much more likely to be carbon-based than ...
If life exists somewhere else in the universe, why is it much more likely to be carbon-based than ...
[html]

If life exists somewhere else in the universe, why is it much more likely to be carb
tsk   42   1 Reply
2 months ago
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