Which of the following describes a population?
four species of fish living in a pond
dogwood trees in middletown, connecticut
dogs and cats living in austin, texas
roses and tulips in a garden

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).

i think the answer would be d