Answer:
Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells. Egg cells all contain an X chromosome, while sperm cells contain an X or Y chromosome.
Explanation:
Answer:
b. Providing habitats for wildlife
Explanation:
<em>Dead trees and down wood provide wildlife habitat it is estimated that 2/3 of all wildlife use them at least during one point of their life cycle.</em> They also serve to cycle nutrients, decreasing erosion, etc.
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Demographers study population: migration, birth and aging/death.
urban planners study land for environments for population to see if the land is good enough for a community to build on, that water is safe and the air is clean enough.
they find areas fit for neighborhoods to be built and or cities. make sure everything is safe and the fight size in land.
