Which compound of earth's atmosphere is decreased due to photosynthesis
a. ozone
b. oxygen
c. hydrogen peroxide
d. carbon dioxide

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal response by in order to it's core temperature.