Select the correct statement about the immune system. a. All antigen receptors produced by a single B cell or T cell are identical and bind to the same epitope. b. Antibodies are secreted by T cells. c. Adaptive immunity is characteristic of invertebrates and vertebrates.

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

During photosynthesis, hydrogen ions are most directly used to in the chloroplast pictured above. a) make glucose b) make chlorophyll c) produce carbon dioxide d) drive the production of atp

Based on the data in the graphs do you think pepsin and trypsin are found in the same part of the body? explain your answer.