If soil is 1000 years old is it young soil

What is the percent composition of blood?

The phosphate heads of a phospholipid are?

Which level has the most biomas? (Ecological pyramid)

If you were to inject a substance that prevents the hypothalamus from releasing gnrh near the end of the follicular phase of an otherwise normally functioning female, what would be the most likely result?

What is one way the vision of primates is different from that of other animals?

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain

How do enzymes catalyze chemical reactions (don't just say "they lower the activation energy", give me specific mechanisms) ?

What must happen before the cell can go through mitosis? Interphase.

Belle's grandfather lives in a region where the temperature drops below 0*F at night. When belle visited her grandfather, they hiked up a hill. Belle noticed that a lot of rock had cracks in them.

The genetic condition of an organism that has two identical alleles for a given trait.