Answer:
D, organisms that survive long enough to reproduce.
Explanation:
C and D are the best answers. Adaptations and skills other than speed and strength contribute to an organism's survival too, so that means it isn't C. Natural Selection is about how an organism must have useful traits to survive to reproductive stage and successfully reproduce, so it would definitely be D.
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It serves as a barrier to biological activity.
Answer:
A
Explanation:
All carbohydrates no matter how small are made of carbon,hydrogen and oxygen
