What is the modified substance in an enzyme reaction?

Enzymes as biological catalysts, activation energy, the active site, and environmental effects on enzyme activity.

Explanation:

I tried :)

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus