Why is it important that an exact copy of the original dna is made before cell division?

What are the mechanisms that have claimed to explain the movement of Earth's tectonic plates. A. slab pull and sea-floor spreading B. mantle convection and continental drift C. mantle convection, ridge push, and slab pull D.

What's the difference between meiosis and mitosis?

Martha's child was born with an extra chromosome resulting in down syndrome. this is an example of:martha's child was born with an extra chromosome resulting in down syndrome. this is an example of:

Evaluate the importance of the microscope to the development of the cell theory

What is the function of a pedigree? O A) A diagram that explains the results of a test cross between two organisms. O B) A diagram that traces the inheritance of a particular trait through generations.

Which of the following is a property of minerals? a. Age b. Odor c. Hardness d. Size

What created the abundant agriculture in the Napa Valley of California? A:oceanic-continental convergence B: an earthquake C: a tsunami D:continental-continental convergence

Why is it difficult for most chemical reaction in living things to occur without enzyme?

Touch sensations and proprioception are carried primarily along the: a. spinocerebellar tract b. dorsal column system c. spinothalamic tract d. spinoreticular tract

What is the first step of DNA replication?