Which occurrence most likely led to the other
three?
(1) human population growth reached 6.8 billion
in 2010 and it continues to increase.
(2) the number of african elephants has
declined from 1.2 million in 1979 to about
20,000 today.
(3) approximately 6,500 gallons of oil were
spilled into a river in illinois after a pipeline
broke.
(4) at one time, rain forests covered 14 percent
of earth and today they cover only 6 percent.

What are two reasons for why a species might disappear from the fossil record?

Why is the statement not a hypothesis? sunflowers require soil and plenty of sunlight and water to grow and thrive.

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.