Which statement is true of crossing over

A - what occurs during prophase of mitosis

B - it allows for genetic variation

C-it occurs only in animals

Which of these classes of biological molecules consist of both monomers and polymers?

What element is able to combine with itself and hydrogen to form large molecules?

Do you think the sun is the future of energy production?

Underground limestone caves form a. from the cooling and solidification of magma below the surface. b. from the compacting and cementing of weathered rock fragments. c. when carbonic acid and carbon dioxide combine. d.

52. How does the immune system differentiate a pathogen from body cells? A. Pathogens have especially weak cell membranes that the immune system can break. B.

What would be the consequence of of absence of tRNA in the cytoplasm?

Water which is returned to the environment after secondary treatment is known as:

Which tool is best used to predict the outcome of various genetic combinations?

What part of the brain consists of two large hemispheres?

How many Calories are in 1 serving cup skin milk? n