PLEASE Help Me You observe that grass seems to grow better in soil than it does in gravel. Design a scientific experiment to test this. What is the independent variable? What is the dependent?

In which layer do organisms on earth love?

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants. d- food molecules are broken down in the cells if living things.

Why do mountaineers become breathless as they reach high altitudes