Which vitamin is produced by the skin in response to ultraviolet light?

(A) vitamin A

(B) vitamin B

(C) vitamin C

(D) vitamin D

5. Many scientists believe that the current period of global warming is related to increased levels of A. radon being released from the Earth's soil. B. carbon dioxide in the Earth's atmosphere. C.

A chemical family whose members exist as reactive diatomic molecules in the gaseous phase is the? A. actinide series B. alkali metals C. halogens D. lanthanide senes

What is the role of cellular reproduction in maintaining genetic continuity

When examining an endocrine cell from a new species of mammal under the microscope you find that it contains an abundance of rough endoplasmic reticulum, a large Golgi apparatus, and secretory granules.

During gel electrophoresis, restriction enzymes are used to cut dna into fragments. those fragments are then added into a well cut from a slab of gel.

How are dichotomous keys used?

Which would provide the body with the most energy? A. Creating bonds to form a carbohydrate B. Breaking a single carbon bond C. Breaking the bonds in a monosaccharide D. Forming bonds between two amino acids

Today's beverage pasteurization processes are the result of this scientist's work.

Why are scientific theories changed but never thrown away?

What would have happen to an animal if all of its mitochondria disappeared?