A marshmallow is toasted over a campfire. Is this a physical or a chemical change? Claim:

Evidence 1:

Reasoning 1:

Evidence 2:

Reasoning 2:

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

Number and variety of living organism; includes genetic, species, and ecological types