How are seeds produced?

When the ovum is fertilized by pollen tube core, it starts a process of differentiation which leads to the seed generation. In angiosperms, the fruit formation occurs from the ovary of flowers, simultaneously and in a similar way to the formation of seeds.

Explanation:

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it's c. (to reduce the greenhouse effect/carbon gasses)

the answer is "a.) well–developed vascular system."

explanation: