Animal biodiversity - mammals

Question 1

what defines the class mammalia?

Answer 1

they have mammary glands producing milk

Question 2

how do mammals stay warm?

Answer 2

they are endothermic with hair made of keratin and fat for insulation

Question 3

what is the skull like in mammals?

Answer 3

synapsid with a large brain case

Question 4

what is the dental formula for mammals heterodont teeth?

Answer 4

I-C-P-M

Question 5

what is the now extinct ancestor of mammals?

Answer 5

therapsid reptile

Question 6

3 features of the group prototheria?

Answer 6

1) monotremes - 1 opening
2) lay eggs
3) possess hair and mammaries

Question 7

what is the main feature of the group metatheria?

Answer 7

they are pouched mammals where embryos are nourished mainly by yolk then placenta

Question 8

how do eutheria offspring develop?

Answer 8

in the uterus - placental mammals

Question 9

how many major lineages of eutheria are there?

Answer 9

4

Question 10

what continent do afrotheria mammals inhabit and name 2 species

Answer 10

africa - elephants and manatees

Question 11

what continent to edenta mammals inhabit and name 3 species

Answer 11

south america - sloths, anteaters and armadillos

Question 12

which group of mammals are considered to be most primitive?

Answer 12

insectivora

Question 13

what does the group Artiodactyla include?

Answer 13

sheeps, pigs, deer

Question 14

what are the group cetacea adapted for?

Answer 14

aquatic life

Question 15

describe the toes of Perissodactyla

Answer 15

odd toed ungulates

Question 16

what are the teeth of lagomorpha like?

Answer 16

hypsodont - with rootless incisors

Question 17

which mammalian group is the most specious?

Answer 17

rodentia

Question 18

describe how rodentia pass food?

Answer 18

they do the process twice to acquire all the nutrients