Fluctuations in the phosphorus cycle in aquatic ecosystems . a. can lead to changes in the growth rates of aquatic populations b. are never caused by human impact on the environment c. lead to a decrease in the amount of phosphorus found in sediment d. never occur naturally

explanation:

okay now i don't know this but for the pints nothing else to say bye

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.