33. What role do antigens play in many autoimmune diseases?
A) They cause an immune response.
B) They are how some diseases are inherited.
C) They destroy the immune system.
D) They destroy all body cells.

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?

9. the history of life on earth is recorded in

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.