Recall the name for the total amount of living matter in each trophic level of an ecological pyramid.

Select all the true statements about the cosmic microwave background radiation

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

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