The protrusible rasping organ in a mollusk's mouth that is used to scrape food from the substrate is
A. a visceral mass.
B. an ammonite.
C. a radula.
D. a veliger.
E. composed of nacre.
Answer: C
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a. epinephrine b. insulin c. estrogen and testosterone d. growth factors e. neurotransmitters
The climax community ____
a. is formed by species with the greatest range of environmental tolerance b. is the most common community found in an area c. changes over time d. is well adapted to the climate and persists until the climate changes e. is seasonal
Which of the following growth media are both selective and differential and favor Gram negative growth?
A. Blood B. MacConkey C. Mannitol Salt Agar D. Eosin Methylene blue (EMB) A. A, B, and C B. B, C, and D C. B and D D. A and C E. A, B, and D
The maximum population density of a given species that a defined geographical area can sustain over time is known as the:
A) carrying capacity. B) ecosystem capacity. C) community capacity. D) maximum yield.