David wants to live more sustainably and use a more environmentally friendly fuel source than the coal he currently uses to heat his home. Which choice would be the most sustainable?

In a drought streams and rivers dry up first. True or false

The oceans cover about 70 percent of the Earth's surface. Ocean water contains salts and we say that ocean water has a certain salinity. You are very familiar with a salt: NaCl. But there are other salts in the oceans.

Plant organs seen in the drawing.

Suppose two scientists perform the same experiment separately, but their results are very different. what could they do to find out why this happened

Which property of water allows dogs to cool themselves by panting?

Prokaryotes whose cell walls do not contain peptidogly can

Which is true regarding tolerable upper intake levels (uls) ?

Which cells quickly respond to produce antibodies on second exposure to the same antigen?

The difference in the concentration of a substance from one location to another is called a

Which statement is true about nitrogen and oxygen? A. They make up about 99.9% of the human body B. They are both used to make water molecules C. They are both made of protons, neutrons, and electrons. D. They both contain no subatomic particles