What is true of sand dunes?

A) They are built by waves.

B) They are made by rivers cutting through land.

C) They are built by water carrying sediment away.

D) They are built by the deposition of sand by wind.

Why didn't the three candles stop burning at the same time after the jars were placed? What does this tell us about the rate of a combustion reaction?

While repeating Pasteur's experiment with the swan-necked flask, John Tyndall occasionally observed the opposite result. Tyndall noticed that the boiled broth in the swan-necked flask sometimes did give rise to microorganisms.

In the muscle in your body blank energy is changed into black energy

What process explains how energy is made available for muscle contraction

Smooth muscle is also called A. connective tissue. B. voluntary muscle. C. involuntary muscle. D. epithelial tissue.

Which of the following is the era in which we now live? Mesozoic Phanerozoic Cenozoic Paleozoic

Adenine pairs with what

Trees take carbon dioxide out of the air and convert it to oxygen, so the government funds a tree-planting initiative by offering $300 to any citizen who plants a tree.

How many cells does a unicelullar living organism have

When does a wheel and axle have a mechanical advantage greater than one?