The smaller fish eat moss and algae off the rocks to survive, while the bigger fish eat the smaller fish to survive.
Food
As a food source.
It gives us fish food
It was once believed that the sun was the essential energy source for all life, but it has been discovered that there is life dwelling in regions that receive no sunlight. For instance, the depths of the ocean. Therefore it can be concluded that some form of "food" or nutrient, whatever it may be, is the ultimate form of energy for life.
Phytoplankton, which is a microscopic and autotrophic organism. There are trillions of phytoplankton in the ocean.
Food
fish sharks penguin
It has effect on the marine life, especially in the anufacture of food.
availability of food
Source of food and oxygen. No plants, no life.
To be a better life form,like the human or animal race. Or to dominate Earth. Or to be in a better life source. Or to have arms,legs,and a face. Or to have a wife. NOTE:this is only for the flower plant rose,obviously.
Plants use energy from the sun to produce their food( gulcose) in a process called photosynthesis . When animals eat these plants , then other animals eat animals that eat those plants , there you have a life cycle that has the sun as a base source of energy.