Which is a density dependent factor

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

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.

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates