A feature that only mammals have is:

a. predatory behavior.
b. internal skeleton.
c. bilateral symmetry.
d. a skeleton of calcium carbonate.
e. hair.


Answer: e. hair.

Biology & Microbiology

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What are some traits of nonvascular plants that allow them to grow on rocky surfaces, in cold areas or during drought?

What will be an ideal response?

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Following fertilization, an ovary will develop into ____________, whereas an ovule will become ______________

a. a. a fruit; a seed b. an embryo; a fruit c. a seed; an embryo d. a female gametophyte; a seed e. a fruit; a female gametophyte

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Which hormone prevents menstruation in a

pregnant woman?

a. follicle stimulating hormone b. lutenizing hormone c. estrogens d. human chorionic gonadotropin e. testosterone

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Which of the following is NOT an oncolytic virus?

A. Retrovirus B. Adenovirus C. Vaccinia Virus D. Simplexvirus

Biology & Microbiology