Research and identify a vestigial structure of an organism of your choosing. Why does the organism not need that structure anymore? (Think about what the structure's original purpose was.)

Construct at least two possible hypotheses for the student’s experiment.

Which organ controls breathing? lungs alveoli heart diaphragm

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.