Evaluate the paragraph that examines the relationship between MHC molecules, T cells and B cells. Choose the correct answer from the choices given.

The shift of a vehicle's weight around its center of gravity is known as

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?