What is the symbol for the most common element in the universe

Where does the heat for geothermal energy come from? A. From the sun's ultraviolet rays B. From magnetic waves in the Earth C. From steam produced by the Earth D. From warm sections of the ocean

Amino acids are the building blocks of which class of macromolecules?

The difference in charge across the membrane is called the . It is measured in .

How is the landscape of Venus different from the landscape of Earth?

The retina of the eye responds to light, converting it into electrical impulses. the retina is made up of:

Using a broom to clean sidewalks and driveways is a way to reduce water pollution

From which location does seafloor spreading originate? mid-ocean ridges edges of continents deep-ocean trenches underwater volcanoes

What organ in the human body is like an organelle in a cell

Which phrase best defines erosion? A. cementing layers of rock together to form stone B. moving bits of rock and soil from one place to another C. layering bits of rocks and soil D. breaking up rocks into smaller pieces

How do living things respond to their environment? Provide 2 examples.