What helps keep moisture in soil and holds roots in place in very windy areas like the Great Plains?

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

What is the problem in this article? what solution does the article propose?

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel