They come from the atmosphere, since plants use carbon dioxide to produce carbohydrates :)
The correct answer would be D. because the patient's eyes have oddly shaped corneas. I really hope that this help's. I just moved to the U.S. so please dun't be mad at me if it's wrong.
Can't be gravitational, due to the fact that atoms are way too small to have a gravitational pull for something of similar size.
The strong nuclear force is the answer you're looking for.
Answer: directional
Explanation:
Because only one trait was favored. When bears are cold, being bigger helps them better adapt to the coldness. Adjusting to the weather is one trait.
