Archaeopteris belongs to the now-extinct lineage of seedless vascular plants called ____, and is proposed to be the
possible ancestor of gymnosperms.
a. Charophyta
b. Monilophyta
c. Lycophyta
d. proangiosperms
e. progymnosperms
ANSWER: e
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In the human diet, linoleic acid and linolenic acid are the only essential fatty acid acids
Indicate whether the statement is true or false.
Which of the following is the most advanced nervous
system? a. a diffuse system with scattered neurons b. an asymmetrical system c. a radially symmetrical system d. a system with paired nerves, paired sensory structures, and paired brain centers e. a nerve net
The bark from _______ tree species was the original source of salicylic acid, the pain-relieving substance in aspirin.
A. Willow B. Cinchona C. Kola D. Maple E. Yew
Certain small towns in the western United States have remained isolated since their settlement many years ago. Some alleles are more common in these communities as compared to the rest of the US population. This difference is a result of
A. disrupting selection. B. the founder effect. C. directional selection. D. the Hardy-Weinberg principle. E. artificial selection.