Biology Forums - Study Force

biology 1 can you please help me with this questions from chapter 32 33 and 34 of campbel 8th edition ?


6.  Using the choices listed as 1 – 4, match the events listed below with the eras in which they occurred. Choices may be used once, more than once or not at all.
1. Neoproterozoic Era   3. Mesozoic Era          2. Paleozoic Era   4. Cenozoic Era

------- Origin of wings for flight
------- Cambrian explosion
--------Cooling of global climate
--------- Mass extinctions of flightless dinosaurs
--------- Vertebrates made the transition to land and diversified
--------- Ediacaran biota

7.  Compare three aspects of the early development of a squirrel (a chordate) and a garden snail (a mollusk)
salamander
1
2
3
sea scallop
1
2
3


8. Based on the two phylogenetic trees above, list five points of agreement and four points of disagreement between the two trees. Briefly explain each in your own words (please use point form).

please explain the points of agreement and points of disagreement

9- (b)  What evidence is used to separate these phyla (e.g. Annelids, Arthropods, and Molluscs) from the Echinoderms and Chordates?

4.  List 3 major changes in structure and function that are seen in terrestrial animal groups as compared with aquatic animal groups?   Explain how each of these changes conferred advantages to animals as they moved onto land.

Echinoderms and Chordates are deuterostomes. This means that, develop mentally, they undergo radial indeterminate cleavage. In the development of the digestive tract, the mouth forms from a secondary opening opposite the blastopore and the coelom forms from mesodermal outpocketings off the primitive gut or archenteron.