$VO_2 = Q \times (CaO_2 - CvO_2)$

Question 1

Which of the following is considered the closest living relative to animals, based on phylogenetic evidence?

Accepted Answer

Choanoflagellates

Question 2

The Cambrian Explosion is significant in animal evolution because it marks:

Accepted Answer

A rapid increase in animal diversity and the appearance of most major animal phyla

Question 3

Which of the following is NOT a requirement for animals to survive?

Accepted Answer

Photosynthesize to produce energy

Question 4

Which major evolutionary innovation allowed vertebrates to colonize land?

Accepted Answer

Evolution of the amniotic egg

Question 5

During which period did the first fishes with spinal columns appear?

Accepted Answer

Ordovician

Question 6

Which of the following factors is believed to have contributed to the rapid diversification of animal body forms during the Cambrian Explosion?

Accepted Answer

Increase in atmospheric oxygen

Question 7

Which extinction event is associated with the disappearance of non-avian dinosaurs?

Accepted Answer

Cretaceous-Paleogene (K-Pg) extinction

Question 8

What is the primary function of Hox genes in animal development?

Accepted Answer

Control the body plan and segment identity during embryonic development

Question 9

Which of the following best describes punctuated equilibrium in evolutionary theory?

Accepted Answer

Long periods of stasis are interrupted by short bursts of rapid diversification

Question 10

If an animal lineage develops an internal skeleton and lungs, which major evolutionary transition does this represent?

Accepted Answer

Transition from aquatic to terrestrial life

Question 11

Which of the following equations best represents the relationship between oxygen delivery and metabolic rate in animals?

Accepted Answer

$VO_2 = Q 	imes (CaO_2 - CvO_2)$

Question 12

Which group is most closely related to modern birds?

Accepted Answer

Crocodilians

Question 13

Which of the following is a defining feature of animals compared to other life forms?

Accepted Answer

Heterotrophic nutrition

Question 14

Which major animal group diversified most during the Devonian period?

Accepted Answer

Bony fishes

Question 15

Which of the following best explains why the evolution of the amniotic egg was crucial for vertebrate colonization of land?

Accepted Answer

It provided a protective environment for embryos on land, reducing dependence on water for reproduction

Question 16

Which extinction event resulted in the loss of most reef organisms and occurred around 360 million years ago?

Accepted Answer

Devonian extinction

Question 17

Which of the following is a correct sequence of evolutionary events in vertebrate history?

Accepted Answer

Evolution of bony jaws → colonization of land → diversification of mammals

Question 18

Which of the following is NOT a function animals must perform to maintain homeostasis?

Accepted Answer

Produce their own food via photosynthesis

Question 19

Which of the following best describes the role of the vertebral column in animal evolution?

Accepted Answer

It provided internal support and enabled more complex movement

Question 20

Which of the following statements about animal phylogeny is correct?

Accepted Answer

Animals share a common ancestor with choanoflagellates

Animal Evolution: Phylogeny, Origins, and Diversification

Study Guide - Practice Questions