Which phrase best describes a biogeochemical cycle?

A. The movement of a chemical substance through Earth's bodies of water
B. The movement of a chemical substance between plants and animals
C. The movement of a chemical substance between the solid, liquid, and gaseous states of matter
D. The movement of a chemical substance through the biotic and abiotic parts of Earth

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?