Which of these increases as a submarine dives deeper into the ocean? A: The number of plants in the water
B: The freshness of the water
C: The water temperature
D: The water pressure

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

What form of anesthetic was used for field surgery

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.