How does the extinction of a species affect humans ? a. extinction contributes to the loss is natural food sources. b. extinction generates new sources of medicine c. extinction keep air and water clean d. extinction makes the environment more pleasant

Which of the following conclusions can be drawn

Which of the following is true of photosynthesis? a)carbon dioxide is a reactant b)water is a product c)most reactions within this process are exothermic d)oxygen is a reactant

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of