A catalyst.
A catalyst speeds up a chemical reaction by increasing the reaction's rate. It does so by decreasing the reaction's required activation energy, which allows the products of the reaction to more easily combine. During this whole process, the catalyst does not change.
I think the correct answer from the choices listed above is option A. The condition that would lead to a small population size is a low <span>birth to death ratio. This means that more people are dying than the rate of giving birth which consequently lead to smaller number of people in an area.</span>
C. Saturn
A. Jupiter
F. Neptune
E. Uranus
that is called chlorophyll it keeps the plants green