Competitive exclusion is the result of ____ by two species for the same limiting resource
a. mutualism
b. commensalism
c. competition
d. predation
e. parasitism
ANSWER: c
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What will be an ideal response?
Which of the following terms refers to all
species that live and interact in a specific area?
a. biosphere b. community c. ecosystem d. population e. niche
At which point during pregnancy can human chorionic gonadotropin be detected in the mother’s blood?
1.at the time of fertilization 2.at the time of implantation 3.by the first week of pregnancy 4.by the third week of pregnancy 5.by the sixth week of pregnancy
Synapsis between chromosomes in some species is promoted by special DNA sequences known as
A) centromeres. B) telomeres. C) pairing sites. D) chiasmata. E) bouquets.