31.2-biology

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1.
10 points
Biologists sometimes refer to birds as feathered __________.
2.
10 points
Like reptiles, birds have clawed toes and _______ scales on their feet.
3.
10 points
Even with good care, ___________ wear out and must be replaced.
4.
10 points
Flight requires high levels of ___________.
5.
10 points
An __________ is an animal that maintains a nearly constant body temperature that is not dependent on the environmental temperature.
6.
10 points
____________ reduce heat loss in cold temperatures.
7.
10 points
Birds, like reptiles, reproduce by internal _______ and lay amniotic eggs usually inside a nest.
8.
10 points
_____________ are flightless birds with wings and feet modified for swimming and a body surrounded with a thick layer of insulating fat.
9.
10 points
Scientists hypothesize that today's birds are derived from an evolutionary line of dinosaurs that did not become __________.
10.
10 points
Fossil finds in __________ support the idea that birds evolved from a theropod dinosaur.