Where does the oxygen we breathe come from according to the process of photosynthesis?

How many layers will a heterogeneous mixture have

What were the conditions on earth billions of years ago

9. Which one of the following statements does not accurately describe the diatonic scale as it corresponds to the setup on a piano keyboard? A.

Most land mammals have the ability to rest one hemisphere of their brains at a time. a. True b. False

Courtney and kenzie are doing an experiment to determine which fish food gives their fish more energy. they have two fish tanks, each with the same number, size, and type of fish.

Bob Davison describes the Endangered Species Act (ESA) as an effective tool for conserving biological diversity.

In fruit flies long wings (W) are dominant to short wings (w). What is the phenotype of the unidentified parent? A. wingless B. short winged C. medium winged D. long winged

How could competition play a role in the way populations change?

Explain in your own words why a roller coaster has gravitational energy.

A substance that kills insects that feed on crops but can bioaccumulate up the food chain is known as a: