<span>a reference point for measuring elevation</span>
Answer:
Genetic variation.
Explanation:
It is caused by genes inherited from parents to offspring. It is a result of genetic information from parents.
HOPE THIS HELPED
Answer: 4/Ecological reserve
Explanation:
Ecological reserves are those places which maintain a natural balance of abiotic and biotic resources. Examples are forests, wild life sanctuaries, national parks, and others. These are rich source of biodiversity as these areas are restricted to be affected by the human population. Also the large number and diversity of vegetation is capable of absorbing carbon dioxide, carbon monoxide which is a chief pollutant gas released from automobiles, household chimneys, and industrial gaseous discharge.
Thus Canada forests are ecological reserves which absorbs the pollution from different sources thus they purify the air.
The daytime sky<span> is blue because light from the nearby Sun hits molecules in the Earth's atmosphere and scatters off in all directions. ... At </span>night<span>, when that part of Earth is facing away from the Sun, the sky looks </span>black<span> because there is no nearby bright source of light, like the Sun, to be scattered.</span>
It says answer in YOUR words so you will do it that way and not cheat