T-lymphocytes mature and differentiate in the thymus. Cytotoxic T-lymphocytes secrete antibodies. Cytotoxic T-lymphocytes in direct contact with an infected cell in order to kill it. Cytotoxic T-lymphocytes secrete , which cause a hole in the target cell's plasma membrane.

T-lymphocytes mature and differentiate in the thymus. Cytotoxic T-lymphocytes _do not_ secrete antibodies. Cytotoxic T-lymphocytes __come__ in direct contact with an infected cell in order to kill it. Cytotoxic T-lymphocytes secrete __perforins_ , which cause a hole in the target cell's plasma membrane

Explanation:

rocks and weathering-matching

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added