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Which of the following about positive selection is true?

During positive selection:

Which of the following is true about central tolerance?

Which of the following is true about positive selection?

Suppose the monthly cost, in dollars, of producing x units is given by the function: and currently 40 units are produced. a. What is the currently monthly cost? 2 points b. What is the additional cost if they produce 42 units per month instead of 40? 2 points c. Find the marginal cost and evaluate it for 40 units. 2 points d. Use the marginal cost to estimate the difference in cost between producing 40 and 42 units. This part is 10 points extra credit. 

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? 

Describe the three different  fiber types found in conective tissues:     collegen Elastic  Reticular     

An exocrine gland has a duct

Types of cartilage   are    Mark all that are correct  :