Metanephridia are found in
a. annelids.
b. mammals.
c. flatworms.
d. insects.
e. larval mollusks.
A
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If one left a "pasteurized" flask of broth for a long time at room temperature, it would stay sterile forever, at least in principle.
Answer the following statement true (T) or false (F)
While the pH of saliva ranges from 6.5 to 11.5, the pH in the stomach is about pH 2. What would you expect the optimum pH to be for the enzymes secreted into your stomach that digest proteins into amino acids?
What will be an ideal response?
All of the organisms living together in a particular habitat and their interactions with their non-living environment are called which of the following?
a. biomes b. populations c. ecosystems d. communities
The fruits of plants function in
A. seed dispersal. B. providing food for animals and seed protection. C. providing food for animals. D. seed protection. E. seed protection and seed dispersal.