Keystone predators effect their habitat by keeping the population of animals down.
Answer:
Due to cell wall.
Explanation:
Scientists were able to easily identify the cells in plants first as compared to animal cell because the plant cell has cell wall while the animal cell has no cell wall only cell membrane. The structure of plant cell is just like the compartments and the cell wall provides the boundary between two cell which enable the scientist to see the plant cell first.
The answer should be A capillaries
