because their lungs are smaller and they have more organs to pump blood through
Yes. Bird lungs are more efficient than mammal lungs.
nothing. that is impossible because if it is faster than a bird, then it isn't slower than a snail. and if it is slower than a snail, then it isn't faster than a bird.
the bird is slower than the cricket
No. The fastest bird is the Peregrine Falcon, and it is much faster than a cheetah. In fact, multiple animals are faster than a cheetah.
by there lungs but some mammals can breath longer underwater than us humans
Because the smaller you are the faster you breath
run faster than any other mammal
Placenta through the process of diffusion
Whales, dolphins, and maybe a platypus.
ostrich
The fastest land animal is the cheetah which has a recorded speed of 109.4-120.7 km/h (68.0-75.0 mph). However most birds fly (rather than run!) and many move faster than the cheetah. The fastest bird is the peregrine falcon and with a stoop speed of 389 km/h (242 mph) makes this bird fastest member of the animal kingdom. The fastest ground bird (flightless runner) is the Ostrich which can run at 96.6.km/h (60 mph).
because they have less alveoli