The Law of Conservation of Matter means that: all matter should be used wisely (conserved)
matter will decrease when destroyed by chemical reactions
matter cannot be destroyed or created by known chemical reactions
when two chemicals are mixed, matter may increase

Explanation:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

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).

meiosis is the correct answer