Which layer of soil is least likely to be penetrated by plant roots?

a.

O (organic matter)

b.

A (topsoil)

c.

B (subsoil)

d.

C (parent rock)

Which of these definitions have been paired with the correct type of cell?

Where did the marine life most affected by the extinction live? 1. The Arctic Circle 2. Rivers And Streams 3. Warm Tropical Waters 4. None Of The Above

Describe the purpose of DNA replication

Human albinism is an autosomal recessive trait. Suppose that you find a village in the Andes where 1/4 of the population is albino.

What do cells need to store energy

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.