The protective membranes that surround the brain and spinal cord are called the
A. peritoneum.
B. meninges.
C. myelin sheath.
D. meconium.
Answer: B. meninges
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In pines, the female gametophyte contains _____, each of which contains a(n) _____.
a) archegonia ... egg b) antheridia ... egg c) antheridia ... sperm cell d) archegonia ... sperm cell e) microsporangia ... egg cell
Peas (Pisum sativum) were well suited for Mendel's breeding experiments for all of the following EXCEPT
a) many of the characteristics that vary in pea plants are controlled by single genes b) peas have a particularly long generation time c) peas exhibit variations in a number of observable characteristics, such as flower color and seed shape d) it is easy to obtain large numbers of offspring from any given cross e) Mendel and his staff could control the pollination between different pea plants
How does an apple fly's attraction to a particular type of fruit promote genetic divergence?
A. On apple trees, they are much more likely to encounter hawthorn flies than other apple flies. B. The scent allows female flies to produce more offspring. C. It makes no difference in promoting genetic divergence. D. On apple trees, they are much more likely to encounter other apple flies than hawthorn flies.
Humans still have body hair even though it is greatly reduced and serves little function. The hair is a(n)
A) analogous structure. B) vestigial structure. C) mutation. D) homologous structure. E) adaptation.