Eerythrocyte (red blood cell) count increases after a while when an individual goes from a low to a high altitude because the the erythrocyte (red blood cell) count increases after a while when an individual goes from a low to a high altitude because the basal metabolic rate is higher at high altitudes temperature is lower at higher altitudes concentration of oxygen and/or total atmospheric pressure is higher at higher altitudes concentration of oxygen and/or total atmospheric pressure is lower at high altitudes

The answer is; concentration of oxygen and/or total atmospheric pressure is lower at high altitudes

This means that at high altitude, due to the low pressure, every breath has a lower oxygen content than at a lower altitude. This, therefore, necessitates the body to increase the erythrocyte numbers in the blood to maximize the uptake of oxygen from the thinner air.

allowed for the prediction of the properties of missing elements.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.