All of the following may be involved in feedback
mechanisms in natural communities when
populations become too dense EXCEPT
a. density-dependent factors.
b. limiting factors.
c. biotic potential.
d. physical factors.
e. biotic factors.
Answer: c
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Indicate whether the statement is true or false
You decide to alter the rate of a reaction. Which of the following is not going to help you increase the rate of this reaction?
a. adding more reactants b. adding more enzyme c. adding heat d. mechanically stirring the contents of a beaker of reactants e. adding more product
Which one of the following methods of enhancing fertility involves the placement of sperm and unfertilized eggs into the oviduct?
A) artificial insemination B) in vitro fertilization C) gamete intrafallopian transfer (GIFT) D) hysteroscopy E) zygote intrafallopian transfer (ZIFT)
Hormonal messages can be generally described as:
A) digital B) all-or-none C) analog D) high-threshold responses