Tại sao cha mẹ cho con cái gen mà con giống cha mẹ. Ai giúp em với ạ câu kiểm tra 15p

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

What is the difference between a scientific hypotheses and a scientific theory?

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic