Repeating test usually leads to
• more independent variables
• more accurate measurement
• more confidence in the results
• more controls in an experiment

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

About __ of the mass of the cell is water

Describe characteristics of a good respitory surface