Which of the following areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes?

red pulp of the spleen

germinal centers of the lymph nodes

Hassall's corpuscles of the thymus

white pulp of the spleen

The vaccine in a flu shot contains weakened flu viruses. How does a flu shot work with the immune system? A. It destroys lymphocytes. B. It destroys macrophages. C. It activates macrophages. D. It activates lymphocytes.

One of your friends is originally from Ecuador. When he was a kid, he would sneak into the forest and watch howler monkeys. On one of these trips, though, he insists that he and his friends found a human skull.

Drought and water shortage: what's at stake? What can we do?

ATP is synthesized by substrate-level phosphorylation during which of the following? A. glycolysis only conversion of pyruvate to lactate B. only Krebs cycle C. only glycolysis and the Krebs cycle D.

A. What is a hypoxic zone?

An observable trait in a species of frog is controlled by a single gene. The gene has only two alleles, F and f, and F shows complete dominance over f. A predator is introduced into a population of 400 frogs, of which 100 are homozygous recessive.

The area in the brain that plans, anticipates, and controls impulses and is the last part of the brain to mature is the

What event occurs prior to speciation

Is chocolate in chocolate milk a solute

3 different types of cells