Answer:
Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately affects the animal's phenotype.
Explanation:
Carcinogens. They come in many forms (search them up) and can be very harmful.
Answer:
The answer is,
A. the total number of protons plus neutrons
Explanation:
Hormones.
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