Because most birds travel through the air at high speeds, they must have

a) highly sensitive sensory systems.
b) eggs and no placenta.
c) a crop and a gizzard.
d) complex songs.
e) a three-chambered heart.


Ans: a) highly sensitive sensory systems.

Biology & Microbiology

You might also like to view...

In a ribbon model of a polypeptide, broad arrows indicate:

A. -sheets. B. -helices. C. disulfide linkages. D. -sheets and -helices. E. All of these choices are correct.

Biology & Microbiology

If DNA repair mechanisms were perfect, which of the following would most likely result?

A. We would live forever. B. Evolution as we know it would stop because mutations are the only agent that gives us new genetic variation. C. The rate of evolutionary change would dramatically increase. D. Humans would stop aging, as aging is a collection of DNA mutations. E. All of the answer options are correct.

Biology & Microbiology

As a protein is being synthesized, the correct folding of the protein is aided by the movement of nonpolar amino acids toward the inner areas of the protein. How can this phenomenon be explained? How will this influence other levels of protein structure?

What will be an ideal response?

Biology & Microbiology

The bacteria on the outside of termite protozoa

A) Digest cellulose. B) Steer the protozoan to food. C) Are transient microbiota. D) Propel the protozoan. E) None of the above

Biology & Microbiology