Which parameter differentiation the following pair of signs: FIX and TRAFFIC

Which parameter differentiates the following pair of signs: CHOCOLATE and CHURCH

Which of the following is true about negative selection?

Which of the following about positive selection is true?

During positive selection:

Gamma:delta T-cells need to have antigens presented to them using MHC molecules, hence they need to undergo the process of positive selection.

Which of the following is true about central tolerance?

Which of the following is true about positive selection?

Graph the function (4 points). Present: 1. Domain (2 points) 2. Detailed table of ordered pairs and the graph (4 points) 3. Identify the range (after you graph the function) (2 points) 4. Is the function continuous everywhere on its domain? Present the definition of continuity at a point. (2 points)  

Short answer: answer the following; each part is worth .5 points:    Define Stem Cell Where are they found? What possible benefit could they have in science?