What is the floor of an aquatic biome called

When sodium chloride dissolves in water the sodium cholride dissociates into?

Compare the two theories regarding the evolution of dinosaurs and then consider the cladogram above. although the two theories differ on the evolutionary path of dinosaurs, they agree that

In 1859, the english naturalist charles darwin published a book entitled on the origin of the species. one of the major ideas that was presented in his book was the theory of natural selection. what was another idea that was presented in his book?