class mammalia characteristics Flashcards
(7 cards)
1
Q
what are the derived characters of mammals? (6)
A
1) mammary glands
2) keratinized hair
3) endothermic
4) larger brain
5) efficient resp/circulatory systems
6) differentiated teeth
2
Q
what are mammary glands used for and where did they come from?
A
came from sweat glands to nourish young
3
Q
what is hair a derivative of?
A
skin
4
Q
what does it mean for an organism to be endothermic?
A
internal mechanisms to maintain body temp
5
Q
what are chisel, canines, and pre molars for?
A
chisel: used for clipping/gnawing
canines: used for tearing flesh
premolars: flat/broad for chewing
6
Q
relationship b/w mammals and reptiles
A
major modifications in the way the jaw articulates with the bone
7
Q
what is the dentary squamosal?
A
reduction of bones in the jaw
