Which of the following species' range has extended extensively over the past 100 years?
A) grizzly bear
B) gypsy moth
C) polar bear
D) spotted owl
B
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Most of the chemical compounds produced by the body are synthesized by the ________.
Fill in the blank(s) with the appropriate word(s).
Sensory signals are also referred to as
a. efferent. b. motor. c. reverberating. d. saltatory. e. afferent.
What advantage do gymnosperms have over ferns?
A. Gymnosperms produce pollen and do not require water to reproduce. B. Gymnosperms have alternation of generations. C. Gymnosperms have a vascular system, which allows them to grow taller. D. Gymnosperms can grow larger gametophytes. E. Gymnosperms can produce flowers and fruits to aid in seed dispersal.
What would happen to an egg that had a nonfunctional chorion?
A. The embryo would die due to high levels of toxic metabolic wastes. B. The embryo would starve in the egg. C. The embryo would suffocate or dehydrate. D. The embryo would develop normally.