Why did Gregor Mendel choose to use purebred plants in his experiments?/

A They reproduce sexually.

B They exhibit only one form of a trait.

C They have a variety of traits.

D They reproduce asexually.

If nearly 79%of the atmosphere is made of nitrogen, how could there be a shortage of nitrogen in soil?

Select all that apply. What is the difference between DNA and RNA? A. DNA is a protein and RNA is a nucleic acid. B. DNA uses deoxyribose and RNA uses ribose. C. DNA has adenine and RNA has thymine. D. DNA has thymine and RNA has uracil.

A large percentage of the sun's energy is absorbed by earth's surface. true false

Why don't the gametophytes or the gametes of seed plants need standing water to function?

What "drives" plate tectonics? A) lava B) conduction C) continental drift D) heat and convection

Why do municipal water treatment plants not use distillation?

How does a kangaroo take care of three babies with only one pouch?

Using the defects method, which of these relationships represents the Law of Cosines if the measure of the included angle between the sides a and b of ∆ABC is more than 90°? a.

How is carbon exchanged between the geosphere and biosphere to maintain life?

The cholera bacterium Vibrio cholerae produces an enzyme toxin that chemically modifies a G protein involved in regulating salt and water secretion in intestinal cells.