The joints of the human skeletal system

a. keep us upright.

b. hold bones in place.

c. allow for flexible movement.

d. have fluids that fight disease.

Positively charged particles located in the nucleus of an atom are A. Protons B. neutrons C. Electrons D all of these choices

Do proteins code for RNA or DNA?

All cells of the body age and are replaced in a natural order. When RBCs age, they are destroyed in the spleen. During this process, the iron from their hemoglobin is released into the circulation and returned?

The so called "double fertilization" is restricted to angiosperms. True or False

What is the name for the inner portion of the kidney?

Give four reasons why organic material is good for the soil.

What is true about psychosocial changes observed in adolescents? select all that apply?

This causes substances to move across the cell membrane, against the concentration gradient. Select one: a. active transport b. neutral transport c. passive transport d. hydrophobic transport

1. The nerve impulse is an electrical current that travels along dendrites or axons. True or false

What led to the conclusion that single-celled prokaryotic organisms evolved in the absence of oxygen