List and explain sources of evidence that scientists use to support the theory of evolution

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin

Which structure in the cardiovascular system connect arteries to veins?

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution