Cells often store materials like water, salts, proteins and carbohydrates in sac-like structures called

A) chloroplasts.
B) lysosomes.
C) mitochondria.
D) vacuoles

Ture or false evidence for evolution includes millions of fossils

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.

What type of tree is the tallest tree in the world?