How do different species depend on one another in a natural environment?

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

Suppose you were the commissioner of corrections for your state. which correctional activities might come within your domain? which mostly would not

Which of these parts of the membrane large moecules pass through it ?