Approximately how much of the water found on earth is non-fresh

Look at the diagrams below: why are these considered organic molecules? a. They are found in nonliving things. b. They are made from many carbon atoms. c. They are very large. d. They have a lot of oxygen atoms.

Prenatal detection of chromosomal abnormalities is accomplished chiefly by

In facilitated diffusion, do molecules move down their concentration gradient?

List three pollutants the burning of fossil fuels adds to air. What are the sources of these three pollutants?

Where do echinoderms live?

4. A tree dropping its leaves in the fall to conserve water and avoid freezing during winter is an example of?

Which is a single-celled fungus? A. mold B. mushroom C. alga D. yeast

Explain problems with using low-tar, low-nicotine cigarettes.

Some students are comparing the parts of a cell to the parts of the body. Which part best represents the cell membrane and why?

What is the difference between the nitrogen and carbon cycles?