Fungi rapidly colonize leaves that fall into freshwater streams. They break down the cellulose in the leaves and absorb the glucose produced. In turn, the fungi serve as food for many insect species that consume the leaf litter; these insects cannot digest cellulose themselves, but gain the nutrients from cellulose indirectly. The insects then provide vital food for stream fish. Taken together, these relationships suggest that fungi __________
Fill in the blank(s) with the appropriate word(s).
Answer: benefit fish by helping insects obtain nutrition from dead leaves
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What concepts enable two or more species with similar niches to coexist in a community? Select all that apply.
_____ allopatric competition _____ character displacement _____ resource partitioning _____ overlapping niches _____ bottom-up control
In the tropics, warm but nutrient-poor water above continental shelves is often occupied by ____
a. coral reefs b. kelp forests c. rocky shores d. salt marshes e. phytoplankton blooms
Which statement is true of DNA's structure?
A. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. B. In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine. C. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. D. When adenine base pairs with thymine, they are linked by three hydrogen bonds. E. All four bases in DNA can be found in equal quantities.
Snakebites are treated with (antisera/antitoxins/antivenins).
Fill in the blank(s) with the appropriate word(s).