How does the ocean affects ecosystems?

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

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