Giant kelp has gas-filled sacs to it float so it can

a. collect more sunlight

b. trap small fish

c. move with the ocean waves

d. send signals to other plants

The answer to this question would be: A.Collect more sunlight

Giant kelp using the air inside it sac to push its body so it would float in the ocean. This will make it able to take more sunlight since sunlight intensity will be lesser in the deeper area of the sea. More exposure to sunlight will increase the photosynthesis rate of the giant kelp so it can produce more food.

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.

Ithink the answer is d.