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I think the correct answer would be strong gravity. The factor that allows the earth to hold onto water would be the strong gravitational pull of the earth. In fact, it is what holds everything onto earth not only water. Hope this answers the question.
I think the answer is A. Competition. :)
Like small animals that could go underground crocodiles could go underwater to avoid being affected by the meteor even Crocs prefer the land if they felt threatened they would go into near by lakes,ponds,etc for protection
The choices can be found elsewhere and are as follows:
<span>A) They are all wind pollinated.
B) They are heterosporous.
C) They can reproduce asexually by producing gemmae.
D) They require water for reproduction.
</span>
The correct answer would be option D. Besides not having vascular tissue, they require water for reproduction. <span>Their flagellated sperm must swim through </span>water<span> to reach the egg. Hope this answers the question.</span>
