Scientists have identified and named

a. all living species
b. all living and extinct species
c. all extinct species
d. a fraction of all species


Ans: d. a fraction of all species

Biology & Microbiology

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Acquired immune deficiency syndrome (AIDS) now infects about

a. 20 million people; however, the number is decreasing because of an effective vaccination campaign. b. 20 million people; however, the number is decreasing because of effective antibiotic treatments. c. 33 million people; however, the number is decreasing because of an effective vaccination campaign. d. 33 million people; however, the number is decreasing because of effective antibiotic treatments. e. 33 million people, and continues to spread.

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Four of the five answers listed below are endocrine glands. Select the exception

a. thymus gland b. salivary gland c. parathyroid gland d. thyroid gland e. pituitary gland

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The division of cytoplasm is ____________________

Biology & Microbiology

Which of the following events initiates the process of exhalation?

A) Expansion of the lungs B) Relaxation of the diaphragm C) Contraction of the diaphragm D) Contraction of the intercostal (rib) muscles

Biology & Microbiology