Our environment plays a big role in our health. If we do not asses our environment, our risk of sickness an disease increases. Any kind of chemical or radiological substances in the air, are exposures that can affect our health. Meaning, the air we breathe, foods that we eat, water we drink from, and products that we use can sicken us if they aren't properly cleaned or pure.
Answer:
The change in total population over a period is equal to the number of births, minus the number of deaths, plus or minus the net amount of migration in a population. The number of births can be projected as the number of females at each relevant age multiplied by the assumed fertility rate.
Muscle its to cover the bones and make a shape,and to protect blood systems
