If line b is perpendicular to line a, and line c is perpendicular to line a, what is the slope of line c?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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.

What advantages does a pedigree have over a written passage?