Which of the following is not a part of darwin’s theory of evolution?
a.
changes in organisms occur immediately.
b.
organisms change over time.
c.
species evolution occurs through natural selection.
d.
organisms developed from common ancestors.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.