Why are the oceans becoming acidic?

A)Because of global cooling

B)Because of excess carbon dioxide in the atmosphere reacting with water and forming carbonic acid

C) Because of the dissolution corals (calcium carbonate)

D) Because of alkaline rain falling into the ocean

In which situations is the principle of cross-cutting relationship useful in determining relative age?

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes