Although there are as many starlings in North America as there are in Europe, genetic variability in the
North American population is reduced relative to that in Europe because
a. there are more environments in Europe.
b. the North American population is derived from a small founder population.
c. there is more gene flow in Europe.
d. there is less mutation in North America.
e. mutation is operating.
B
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The tube feet of a sea star
(a) bear tiny toes. (b) are located only at the tips of the arms. (c) function in movement. (d) protect the organism from predatory fish.
Before the invention of modern abrasive cleansers, which feature of horsetails was used by humans to scrub pots and
polish metals?
a. waxy spores b. silica-rich leaves c. lignin-rich leaves d. cones at the tips of their stems e. silica-rich stems
Which of the following statements is INCORRECT?
a) Oxygen was abundant in the Earth's early atmosphere, before the origin of life. b) Experiments like Miller and Urey's do not work in the presence of oxygen. c) Environments without oxygen are the best for preserving fossils. d) Oxygen attacks chemical bonds and extracts electrons, which prevents the formation of complex molecules. e) The accumulation of oxygen in the early environment was a result of the photosynthetic activity of terrestrial plants.
Skin testing with antigen is used to diagnose ringworm.
Answer the following statement true (T) or false (F)