Reaction A. a combination of two or more substances that keep their identities
B. a mixture that has the same composition throughout
C. a change in matter that does not result in a change in the type of matter
D. the process in which new substances are formed during a chemical change

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Actual age your first developed of age well comparison age refers to absolute age true or false