Answer:
Population density is the number of individuals per unit geographic area, for example, number per square meter, per hectare, or per square kilometer.
Explanation:
In plants, it's produced in the chloroplasts of plant leaves during the chemical process photosynthesis.
Answer:
Sending humans to other planets may cause danger. We dont fully know what these planets are capable of doing. If there is such a thing as life on other planets then we still dont know weather or not life there is friendly or not. They could be harmful, because just as we dont know know exactly who or what they are, they dont know who or what they are either, so its a high chance they may want to defend themselves.
Explanation:
A. Weathering is the correct answer
They study rocks from both the moon and the earth