Which of these is a heterotroph?
A. plant
B. producer
C. consumer
D. phytoplankton

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Hemoglobin is a proton that carries oxygen around your body what is hemoglobin made from

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.