What causes diffusion? i have a test to study for in biology and the only thing i dont get is what causes diffusion.?

The atmosphere of Earth contains primarily which gas? A.) Carbon dioxide B.) Methane C.) Oxygen D.) Nitrogen

Each trophic level has how much less energy

The cells of the suprarenal cortex produce more than two dozen steroid hormones collectively called

Salt marsh, Atlas, and Indianmeal are three types of what insect?

Foods made with solid fats and/or added sugar are considered to contain empty calories because

In which body or cell area are most genes in humans located?

Where are the sensory receptors for sound? the tongue the nose the ears the eyes

Which is a characteristic of the littoral zone of lake erie?

In a small, isolated population of piranhas, one individual is born with a synonymous mutation in a gene that codes for the beta-globin protein found in hemoglobin. After five generations, 5% of the piranhas carry this mutation.

What is dna in biology