Cacti grow slowly due to the fact that they keep their stomata closed for much of the day. why would closing their stomata during the day be an advantage for the cacti? a. it limits water loss through transpiration b. it conserves oxygen produced in photosynthesis c. it recycles carbon dioxide within plant systems d. it protects plant tissues from predators

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.