According to the American Cancer Society, 30 pecent of all cancer deaths is due to

A. ultraviolet light exposure.
B. automobile exhaust.
C. industrial pollutants.
D. pesticide and herbicide exposure.
E. smoking.


E

Biology & Microbiology

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Even before organs begin to form, rudimentary forms of bone begin to form in a fetus due to _____________.

A) the breakdown of hyaline cartilage. B) the formation of secondary ossification sites. C) the activity of chondroblasts. D) the formation of an osteoclast. E) the activity of growth hormone.

Biology & Microbiology

Cilia and flagella (select all correct choices):

A. are specialized cells that move by rotary motion. B. are specialized organelles that move by rotary motion. C. are specialized organelles that propel some plant, algae, and animal cells. D. contain microfilaments arranged in nine pairs around the periphery and two microfilaments in the center. E. contain microtubules arranged in nine pairs around the periphery and two microfilaments in the center.

Biology & Microbiology

What is the partial pressure of oxygen at the start of the systemic capillary beds?

a. 40 mm Hg b. 100 mm Hg c. 70 mm Hg d. 104 mm Hg e. 130 mm Hg

Biology & Microbiology

A common tissue between the fetus and the endometrium that provides nourishment to the developing fetus is the ________

Fill in the blank(s) with correct word

Biology & Microbiology