Many sponges and shellfish provide shelter for aquatic guests who do no harm or benefit to their host. This is an example of 

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


C. commensalism.

Biology & Microbiology

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Which of the following is the stem cell needed to produce the male gamete?

a. Sperm b. Spermatogonium c. Primary spermatocyte d. Secondary spermatocyte

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In all food chains, the flow of energy is unidirectional from the bottom to the top

Indicate whether the statement is true or false

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All organisms need energy to carry out life processes.

a. true b. false

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Helicobacter pylori colonizes the (mouth/liver/stomach/intestine) and can cause severe inflammation and tissue erosion

What will be an ideal response?

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