Explain your !
1. all eukaryotic cells have a cytoskeleton, including plant cells, which have cell walls as well. what does the cytoskeleton in a plant cell do that the cell wall cannot? (2 points)

it acts as a framework inside the endoplasmic reticulum and keeps it from collapsing.
it keep the organelles in place and directs their movement as needed.
it provides energy and to move molecules throughout the cell.
it keeps the dna safely enclosed in the nucleus and holds the nucleus together.

2. cellular respiration is a series of complicated reactions. some of the enzymes that are necessary for the reactions to take place effectively are not produced by the body and must be eaten in a person's diet. which answer correctly explains what happens when a person's diet lacks the necessary enzymes for cellular respiration? (2 points)

the production of atp will increase as the enzyme decreases.
the cellular respiration reactions will use another available enzyme.
the cellular respiration reaction rate that uses the missing enzyme will increase.
the cell's energy level will diminish as the enzyme decreases.

3. while the average human is able to hold his or her breath for approximately one minute, a whale can dive for over 30 minutes without returning to the surface. which of the following correctly describes this difference? (2 points)

whales need less energy than humans.
whales gather energy from their environment better than humans.
whales are able to conserve oxygen better than humans.
whales have cells that produce energy differently than humans.