what is a mammal? Flashcards
1
Q
what are prototheria?
A
monotremes (oviparous, cloaca)
2
Q
what are Therians?
A
bear live young - came from post cretaceous
3
Q
what are metatheria?
A
they are marsupials ( pouch and dentition)
4
Q
what are eutheria?
A
mammals with a placenta- birth live young and feed outside
5
Q
what do all mammals have in common?
A
all warm blooded
have hair
produce milk
have a jaw
middle ear bone
6
Q
what is the hair/ fur made out of?
A
keratinous filaments made in follicles
7
Q
why is the hair coloured?
A
camouflage
communication
thermoregulation
8
Q
what are the important parts of the mammal?
A
vertebrae - cervical, thoracic, lumbar, sacral and caudal
there is much conservation but variations lead to increased and decreased mobility