The correct answer is A. B might sound like it is right but that has nothing to do with what the question is asking. And C is not correct because under the the temperature is 4 degrees c.
The answer is A.
Why: The heart is part of an organism, so that doesn't exactly count. Soil is not alive, and neither is clay. Therefore, Bacteria must be it. Bacteria is a living thing, and can function by itself.
Answer:
<u>B. Organ</u>
Explanation:
Atom → Cell → Tissue → Organ → Organ System → Organism
answer: A. individual within the population acquire traits to adapt to the environment