How many units of energy would there need to be in the first trophic level to end up with 1000 units of energy in the second? In the third? In the fourth?

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 .

When mendel crossed a true-breeding short plant with a true-breeding tall plant all the offspring were tall. which term describes the gene for tallnes?

Match each term to its best definition? sedimentary depositional enviornment