Which best describes the elements that comprise most of earth’s crust?

a.
a chemical combination of a few elements

b.
a single element, such as sulfur or gold

c.
a mixture of metals and nonmetals

d.
a chemical combination of about 100 elements

The body is protected against harmful flu viruses by

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.

Why are common names a problem for scientist?