a. birds are cold blooded. mammals are warm blooded.
b. birds are egg-lying. no mammals are egg-lying.
c. birds have air sacs in addition to lungs. mammals have no such sacs.
d. birds lack a septum between the ventricles. mammals have such septum.
2007-03-05 00:37:58 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Botany
thats option c again....r u preparing for some multiple choice exam or something?
2007-03-05 00:42:42 · answer #1 · answered by Malfoy vs Potter 5 · 0⤊ 0⤋
Definately c.
Both birds and mammals have a septum between the ventricles - arterial and venal blood does not mix, thus the cells receive more oxygen. Metabolism in both is faster, more warmth is produced and their temperature does not depend on the temperature of the environment - they are warm blooded.
Some mammals such as the platypus do lay eggs like birds but feed their youngs with milk.
So the correct answer is c. The air sucs help birds get more oxygen from the air they inhale, which they need while flying.
2007-03-05 00:44:57 · answer #2 · answered by Anonymous · 0⤊ 0⤋
c. birds have air sacs in addition to lungs. mammals have no such sacs
A - Birds are warm blooded
B - There are some egg-laying mammals
D- Bird hearts are similar to mammalian hearts
2007-03-05 00:45:17 · answer #3 · answered by Anonymous · 1⤊ 0⤋
c.birds have air sacs in addition to lungs,mammals have no such sacs
2007-03-05 00:43:13 · answer #4 · answered by Anonymous · 0⤊ 0⤋
c
2007-03-05 00:45:14 · answer #5 · answered by aura f 1 · 0⤊ 0⤋
c
2007-03-05 00:44:57 · answer #6 · answered by RyBialach 1 · 0⤊ 0⤋
c.
2007-03-05 01:21:51 · answer #7 · answered by jamall69 2 · 0⤊ 0⤋