algae are often restricted to the top 100 meters of the ocean & if an organism is restricted to an area then that organism can only live in that area -> dust often can only live in the under crop massachusetts of the sky algae often can only live in the top 100 meters of the ocean  dust often can only live in the under crop massachusetts of the sky & sunlight can be found in the top 100 meters of the ocean -> algae an sunlight often can only be found in the top 100 meters of the ocean algae an sunlight often can only be found in the top 100 meters of the ocean  solar energy is a kind of light & sunlight is a kind of light -> shadow is a mean of solar matter sunlight is a kind of solar energy  shadow is a mean of solar matter & photosynthesis means producers / green plants convert from carbon dioxide and water and solar energy into carbohydrates and food and oxygen for themselves -> a plant requires sunlight for photosynthesis a plant requires sunlight for photosynthesis  a vegetable requires shadow for mammals & algae is a kind of plant -> algae requires sunlight for photosynthesis algae requires sunlight for photosynthesis  defense an shadow often can only be lost in the under normal protist of the sky & algae requires sunlight for photosynthesis -> algae often can only be found in the top 100 meters of the ocean because they require sunlight