What organelle would muscle cells have a lot of and why?

What substance acts to prevent sudden ph changes in bodily fluids?

How do you know that the plant cells in these two images have different jobs, or functions? a. because all plant cells serve different functions b. because they are two different colors c. because their dna are different d. because their structures are different

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