STEP 1: It's important to be sure that we have covered all the possible eggs and sperm that can be created by these two parents, for this allele.
Are these the only possibilities? Explain your answer.

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).

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%