How can I say this in my own words ?

What element is able to combine with itself and hydrogen to form large molecules ?

Describe the impact of deforestation of both abiotic and biotic factors within the tropical rainforest.

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?