Vitamin ____ helps reduce the risk of osteoporosis

a. A
b. B12
c. C
d. D
e. E


ANSWER: d

Biology & Microbiology

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All animals gain or lose heat by a combination of four general mechanisms

Indicate whether the statement is true or false.

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Explain the features necessary for both brown algae and dinoflagellates to be classified in the supergroup SAR.

What will be an ideal response?

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Two important contributions that cleavage makes to development are to

A) establish the basic tissues of the body and define the future nervous system. B) create a multicellular embryo and partition the embryo into developmental regions. C) create a multicellular embryo and establish the basic tissues of the body. D) establish the basic body plan and determine the location of the mouth and anus.

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Many factors control the activity of genes. The array of chemicals that is responsible for turning a gene "on" is known as the ________

A) epigenome B) fingerprint C) genetic engineer D) recombinant gene

Biology & Microbiology