A relationship in which one partner benefits and the other is unaffected is termed

A. commensalism.
B. parasitism.
C. independence.
D. mutualism.


A

Biology & Microbiology

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Which of the following groups is most closely related to the tracheophytes?  

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In an example of embryonic induction, signals from cells in the ________ cause gastrulation

a. dorsal lip b. ectoderm c. gray crescent d. endoderm

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Flatworms can reproduce:

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Which of the following characteristics is present in all chordates? 

A. gills B. notochord C. vertebrae D. All of the above are correct.

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