Which of the following is a substance or mixture that can dissolve in water?
a. vinegar
b. carbon dioxide
c. sugar
d. all of these

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

How do chloroplasts set plants apart from other living things

What was the land like over 500 million years ago? what was under the sea?