Topic 33: Mammals

Question 1

Mammals

Answer 1

Four-legged amniotes that ave hair and produce milk.

Question 2

Why are mammary glands adaptive?

Answer 2

They allow mammals to raise their young independent of environmental conditions.

Question 3

What is special about mammal ears?

Answer 3

They have three middle ear bones that allow for detection of higher frequency. AND they are located deep in the head for better protection.

Question 4

How do Mammals regulate temp?

Answer 4

Endothermically

Question 5

What is a Dentary-Squamosal Jaw Joint?

Answer 5

The lower jaw bone with teeth meets the small cranial bone to form the jaw joint.

Question 6

Mammals teeth are…

Answer 6

Specialized for complex functions and are closer together. They also have two sets of teeth over their lifespan.

Question 7

Diaphram

Answer 7

Mammals have this muscle at the base of the rib cage to contribute to lung ventilation

Question 8

How to Mammals give birth

Answer 8

They are viviparous, giving birth to live young.

Question 9

Monotremes

Answer 9

Echidnas and platypus, egg-laying mammals that provide milk through patches of hair not nipples. (Only 5 species). Have cloacas and no teeth.

Question 10

Shared Derived Traits of Marsupials and Eutherians

Answer 10

1. Viviparous
2. Placenta
3. Milk from nipples

Question 11

Marsupials

Answer 11

Opossums, kangaroos, and koalas.

Question 12

Marsupial Development

Answer 12

Embryo develops in placenta in uterus is very brief, they are instead born as partially developed and crawl to maternal pouch.

Question 13

Marsupium

Answer 13

Maternal pouch in Marsupials.

Question 14

Eutherians

Answer 14

Complex placenta where embryos complete development within uterus jointed to mother through the placenta. Milk from nipples and NO cloaca.