Each microspore becomes a

form two kinds of spores: microspores, which give rise to male gametophytes, and megaspores, which produce female gametophytes.

Microspores are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes. The male gametophyte gives rise to sperm cells, which are used for fertilization of an egg cell to form a zygote.

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answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

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