Answer:
A. organ.. B. Species
Explanation:
1. parts that make up organism are called as organs
2. a group of similar organisms that can successfully interbreed called as species.
Shells are considered biotic because they come from living things. Biotic describes something living or use to be living such as plants and animals. So shells are considered biotic because they come from a living organism.
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Hope that helped:)
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A.The way plant pollen is carried by wind to another plant.
