Vitamin ____ helps reduce the risk of osteoporosis
a. A
b. B12
c. C
d. D
e. E
ANSWER: d
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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.
Explain the features necessary for both brown algae and dinoflagellates to be classified in the supergroup SAR.
What will be an ideal response?
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.
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