Birds differ from earlier vertebrates by

a. their lack of scales.
b. producing land eggs.
c. the ability to maintain a relatively constant
body temperature.
d. the ability to fertilize eggs internally.
e. their possession of a dorsal nerve cord.


C

Biology & Microbiology

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What will be an ideal response?

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Viruses defy characterization as living organisms even though they possess nucleic acids and proteins. The reason why viruses are not considered to be alive is because they

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