Question 1

Which of the following is a defining characteristic of Eutherian (placental) mammals compared to monotremes and marsupials?

Accepted Answer

Their young develop inside the uterus and are nourished via a placenta.

Question 2

Referencing the evolutionary tree, which trait is shared by all tetrapods but not by ray-finned fishes?

Accepted Answer

Legs

Question 3

Which group is the closest living relative to mammals according to the phylogenetic tree?

Accepted Answer

Reptiles (turtles, snakes, crocodiles, birds)

Question 4

Which adaptation allowed mammals to radiate into aquatic environments such as those occupied by whales and dolphins?

Accepted Answer

Return to the sea from terrestrial ancestors, with improved heat retention and less competition

Question 5

Which of the following is NOT a feature that distinguishes mammals from other vertebrates?

Accepted Answer

Amniotic egg

Question 6

Baleen whales are unique among cetaceans because they:

Accepted Answer

Filter plankton from water using specialized plates

Question 7

Which evolutionary innovation is first seen in reptiles and mammals, but not in amphibians?

Accepted Answer

Amniotic egg

Question 8

Which of the following best explains the adaptive radiation of mammals after the mass extinction event?

Accepted Answer

Mammals diversified rapidly to fill ecological niches left vacant by extinct species.

Question 9

Which formula best represents the relationship between body mass ($$M) $$and metabolic rate ($$R) in $$endothermic mammals?

Accepted Answer

$$R = kM$$^{0.75}$$

Question 10

Which of the following is a real-world consequence of the evolution of the placenta in Eutherian mammals?

Accepted Answer

It enables prolonged internal development and nutrient delivery to the embryo.

Question 11

Which group of mammals is most closely related to elephants, based on evolutionary history?

Accepted Answer

Sirenians (manatees and dugongs)

Question 12

Which of the following statements about mammalian diversity is correct?

Accepted Answer

Mammals occupy terrestrial, aerial, and aquatic niches.

Question 13

Which evolutionary trait is shared by both birds and mammals, but not by reptiles such as snakes and turtles?

Accepted Answer

Endothermy

Question 14

Which of the following is a plausible reason why some mammals returned to aquatic environments?

Accepted Answer

To avoid competition and benefit from better heat retention in water.

Question 15

Which of the following is true about monotremes?

Accepted Answer

They lay eggs and produce milk for their offspring.

Question 16

Which of the following best describes the evolutionary relationship between Echinodermata and Chordata?

Accepted Answer

Echinodermata is a sister group to chordates.

Question 17

Which of the following mammals is known for using echolocation to locate prey?

Accepted Answer

Toothed whales (such as dolphins)

Question 18

Which of the following is the largest extant mammal?

Accepted Answer

Blue whale

Question 19

Which of the following is a correct sequence of evolutionary innovations from earliest to latest?

Accepted Answer

Bony skeleton → Lungs → Legs → Amniotic egg → Milk

Question 20

Which of the following is a plausible explanation for the small size of the smallest extant mammal?

Accepted Answer

Small size allows for specialized feeding and use of echolocation calls.

General Biology: Vertebrate Evolution and Placental Mammals (Eutherians)

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