The answer is guard cells.
Guard cells are cells surrounding each stoma. They help regulate the rate of transpiration by opening and closing the stomata. They are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore (stoma).
3 kingdoms are there in the domain archea
To make sure we don't get germs and get sick
The answer is B. and D. they contain plants that purify the water and they take habitats away from animals.