In a commensal relationship, the commensal benefits but the cohabitant is neither harmed nor benefited.
Answer the following statement true (T) or false (F)
True
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The process of apoptosis can remove structures such as mammary tissue in male mammals
Indicate whether the statement is true or false.
The ________ in sperm whales is thought to play a part in the whale's echolocation system
a. rostrum b. ambergris c. spermaceti d. melon
In the axoneme, nexin
A) transports tubulin to the axoneme tip for assembly. B) generates force for outer doublets sliding past each other. C) projects inward from each doublet toward the central pair microtubules. D) links adjacent outer doublets to limit sliding. E) connects each outer doublet to the plasma membrane.
Most sperm cells die in the vagina when entering the female's body because
A) the sperm cannot pass through the mucus. B) the female's reproductive tract is protected by digestive enzymes. C) of the low pH of the vagina. D) the sperm cells have not yet been activated to swim. E) macrophages from the female's immune system destroy all nonself cells.