Where would waxes be most common on desert plants?

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review