Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere. The substance which brought these molecules together to interact is
A. buffers.
B. acids.
C. water.
D. salts.
E. hydrogen.
C
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One of the ways in which the smooth muscle contractions of the digestive tract are controlled is by
A. mass movements. B. the nervous system. C. propulsion. D. peristalsis. E. chyme secretion.
Four of the five answers listed below are the results of fertilization. Select the exception
a. fruit b. seed c. embryo d. pollen e. endosperm
Does the rate of photosynthesis increase with increasing light intensity?
a. Yes, but only initially. b. Yes, the rate increases over the entire range of intensities available in this lab. c. No, within the range of intensities available to test, the rate did not increase. d. No, the rate of photosynthesis decreases with increasing light intensity.
True or False: Since 1817, cholera has swept the world in 14 major pandemics
a. TRUE b. FALSE