Which substance provides humans with their main source of energy? @4.4.8. A @1

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A)

Food

B)

Carbon dioxide

C)

Water

D)

Cholorphyll

If you start with two sinusoidal waves of the same amplitude traveling in phase on a string and then somehow phase-shift one of them by 5.4 wavelengths, what type of interference will occur on the string?

As waves travel away from a source of light, they spread over a larger area. Which describes the effect of distance on the intensity of light?

3x - 4 > 4x - 8 simplify

What studies outer space, the solar system and objects in it

How can you protect yourself from lightning?

Why do you float in space

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?

Why should scientists write reports and give oral presentations of the steps and results of their in investigations?