$$ \text{Surface Area} = 4\pi r^2$ $$; it affects gas exchange and heat loss.

Question 1

Which of the following statements best describes the evolutionary origin of animals?

Accepted Answer

Animals evolved from colonial protists over 600 million years ago.

Question 2

All animals are classified as consumers because they:

Accepted Answer

Eat other organisms for energy.

Question 3

Which of the following is NOT a characteristic shared by all animals?

Accepted Answer

Cell walls

Question 4

Which of the following best explains why a cell containing a nucleus and mitochondria cannot be definitively identified as an animal cell?

Accepted Answer

Both plant and fungal cells also contain a nucleus and mitochondria.

Question 5

Which of the following is the first evolutionary branch point in the evolution of animals?

Accepted Answer

Presence or absence of true tissues

Question 6

Which of the following is a characteristic of sponges?

Accepted Answer

All of the above

Question 7

Cnidarians exhibit two main body forms. What are they?

Accepted Answer

Polyp and medusa

Question 8

Which feature do roundworms and annelids share that flatworms lack?

Accepted Answer

Complete digestive tract

Question 9

What is one modern medical application for leeches?

Accepted Answer

Promoting blood flow after reconstructive surgery

Question 10

Which group of mollusks are predators, and what is a specific example?

Accepted Answer

Cephalopods; octopus

Question 11

All arthropods share three basic characteristics. Which of the following is NOT one of them?

Accepted Answer

Radial symmetry

Question 12

How do arthropods grow, given their exoskeleton?

Accepted Answer

By molting their exoskeleton

Question 13

Which of the following is a distinct difference in embryonic development that echinoderms share with chordates?

Accepted Answer

Development of the anus before the mouth (deuterostome)

Question 14

Which feature do bony fishes share with humans that cartilaginous fishes do not?

Accepted Answer

Calcified bones

Question 15

Reptiles are amniotes, a characteristic they share with which group?

Accepted Answer

Mammals

Question 16

Which adaptation allows mammals to care for their young for extended periods?

Accepted Answer

Production of milk

Question 17

Which of the following statements about human evolution is correct?

Accepted Answer

Modern humans contain DNA from Homo neanderthalensis.

Question 18

Which equation best represents the relationship between surface area and volume in animals, and why is it important?

Accepted Answer

$$ 	ext{Surface Area} = 4\pi r^2$ $$; it affects gas exchange and heat loss.

Question 19

A student finds an animal with hair near a nest of eggs in Australia. What type of mammal is it most likely to be?

Accepted Answer

Monotreme

Question 20

Which of the following is a common misconception about dolphins?

Accepted Answer

They are bony or cartilaginous fish, but in reality, they are mammals.

Step-by-Step Guidance for Biodiversity: Animal Phyla and Structures

Study Guide - Practice Questions