Which factor contributes to both chemical and mechanical weathering?

The answer is d- principle of faunal succession.

Ijust took the quiz. their is no coefficient needed. : )

Radioactive fallout is a result of the fission creation used to ignite the thermonuclear fusion reaction.

3-isopentane; 3-methylbutane, and 1,2-methylpropane do not meet iupac rules, so they are wrong names.the only valid name onthe list is 2-methylbutane, which is the same isopentane.this is its formula:                   ch2                    |ch3 - ch - ch2 - ch3answer: 2-methylbutane