The proliferation of angiosperms is because they are

Answer:

The proliferation of angiosperms is because they are Adaptable.

Explanation:

Angiosperms are those produces the gametes in the separate organs, those are present inside the flower. The embryo development and fertilisation takes place inside the anatomical structure, which provides a stable system of in sexual reproduction which will be sheltered from environmental fluctuation. For the example of co-evolution relationship between pollinator and flower characteristic will be considered. Most of them are mutualistic pollinator, having distinct features.  

it takes hundreds of years to become stable.

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