Which of the following statements correctly describes a difference between plant cells and animal cells?

plant cells have an envelope surrounding the nucleus. animal cells do not.
animal cells contain mitochondria. plant cells do not.
animal cells contain chloroplasts. plant cells do not.
plant cells are surrounded by a cell wall. animal cells are not.

What percentage of light hits earth's surface directly?

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?