Answer:
A dichotomous key is a tool created by scientists to help scientists and laypeople identify objects and organisms.
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Which compound has the greatest number of oxygen atoms per carbon atom is carbon, hydrogen, nitrogen, oxygen.
One of the constant is the water and time
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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