Where did most of the chemical elements that make up our bodies come from?

What causes temperature extremes in the desert

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

How does photosynthesis show the conservation of mass and energy?