Which describes t cells?
they produce chemicals that suppress other t cells and b cells.
they produce chemicals to cause infection and later produce chemicals to “turn on” the immune system.
they produce chemicals to fight infection and later produce chemicals to “turn off” the immune system.
they produce antibodies to fight infection and later die.

They produce chemicals to fight infection and later produce chemicals to “turn off” the immune system. ( third choice)

They produce antibodies to fight infection and later die.

Explanation:

T cells are white cells, which protect our body from diseases and injuries. They don't surpress other T cells, they don't cause infeccions, and don't turn the immune system off.

alzheimer's disease;

football or basketball players.