A keystone species that is a predator will
A) maintain the species diversity in a community.
B) harvest prey species to extinction.
C) help many of its prey reproduce.
D) reduce the diversity of the community.
Answer: A
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A microbiologist is trying to isolate a pathogen expected to be present in very small numbers from a stool specimen in which there are abundant normal microbiota. Which strategy would most likely accomplish this purpose?
A. Enrichment culture followed by culture on selective agar B. Culture on differential media C. Culture in an anaerobe jar D. Culture on enriched media
Which graph shows that species diversity is
much less at the equator than at 60 degrees north latitude? a. A b. B c. both d. neither e. not enough data is provided to answer the question
Which is an intestinal nematode
What will be an ideal response?
The release of ________ during a type I hypersensitivity reaction contributes to swelling
A) histamine B) prostaglandins C) leukotrienes D) both histamines and leukotrienes E) both proteases and prostaglandins