Last week test 9

Question 1

Match each term with the most appropriate explanation.

Pregunta
Afrotheria

Xenarthra

Boreotheria

chorioallantoic placenta

Answer 1

Afrotheria - A clade of placental mammals that evolved on the continent of Africa

Xenarthra - A clade of placental mammals that evolved on the continent of South America.

Boreotheria - A clade of placental mammals that evolved on the continent of Laurasia

Chorioallantoic placenta - A placenta that includes the structure responsible for waste and gas exchange in the ancestral amniotic egg.

Question 2

What does syndactyly tell us about the evolutionary history of the groups of marsupial mammals where it occurs?

Answer 2

Toes 1 and 2 are fused at the base on the hind feet, with 3 enlarged and 4 small and 5 missing.

It tells us that the ancestors where climbing trees.

Question 3

Which other groups of mammals are close relatives of the Order Sirenia (manatees and dugongs)?

Answer 3

The elephants.

Question 4

Match the clades to the commonly used names for the extant mammals.

Pregunta
clade Prototheria

clade Metatheria

clade Eutheria

Answer 4

prototheria - clade of the monotremes

Metatheria - clade of marsupials

Eutheria - clade of placental

Question 5

Which of the following are true for most members of the Perissodactyla (“odd toed” hoofed mammals)?

YOU CAN CHOOSE MORE THAN ONE OPTION, BUT ONLY CHOOSE AN OPTION IF YOU THINK IT IS CORRECT.

Answer 5

Mammals with hooves

number of toes to 3 or 4 or 1

digest plant material in hter intestens, not in the stomach lige cows.

Usally delivering a single young and long pregnancy.