Two questions but one multiples parts

1) SEE ATTACHED PHOTO TO ANSWER :

A) What do the regions numbered 2 and 4 on the graph represent?


a.
Region #2
Region #4
Emigration and birth rate is greater than immigration and death rate.
Immigration and death rate is greater than emigration and birth rate.


b.
Region #2
Region #4
Immigration and birth rate is greater than emigration and death rate.
Immigration and birth rate is less than emigration and death rate.


c.
Region #2
Region #4
Emigration rate is less than death rate.
Immigration rate is greater than birth rate.


d.
Region #2
Region #4
Immigration and birth rate is less than emigration and death rate.
Emigration and death rate is less than immigration and birth rate.


B) The region numbered 3 on the graph represents the __A__ brought on by the limiting factors called __B___.

a.
A
B
Exponential growth
Lag phase

b.
A
B
Environmental resistance
Exponential growth

c.
A
B
Carrying capacity
Environmental resistance

d.
A
B
Lag phase
Carrying capacity





C) The region of the graph that illustrates the exponential growth of a population and the type of graph illustrated are, respectively:

a.
Exponential Growth
Type of Graph
3
J-Shaped

b.
Exponential Growth
Type of Graph
4
S-shaped

c.
Exponential Growth
Type of Graph
2
Logistic

d.
Exponential Growth
Type of Graph
1
Exponential









2) In a particular population of Paramecium species, 20 Paramecia were found in 4 mL of sample pond water. At another location, 76 Paramecia were found in 40 mL of sample pond water.



What is the difference in density of the Paramecium species at the two locations?
Express your answer rounded to two decimal places.

Answer
 Paramecia/mL