What is the male plants reproductive structure called?

The main structure is called the stamen, which can be divided into two parts: the anther, which produces the pollen grains, and the stalk-like filament.

Explanation:

I copied this off a website.

stamen

Explanation:

It's divided into two parts: the anther, which produces the pollen grains, and the stalk-like filament.

answer by yourhope:

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in which structure in the nucleus are ribosomes made?

b) nucleolus!

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".