Which belongs in the blank space of the chemical equation for the burning of
fossil fuels below?
fossil fuel + oxygen gas →
+ water + heat a nitrogen
в. oxygen
c. phosphorus
d. carbon dioxide

As a small change in a person's dna can cause a genetic disorder

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously