Because they need to be close to the surface to be able to perform photosynthesis.
Algae can be found throughout the ocean, from the surface waters down to the deep sea. They can thrive in a variety of marine habitats, such as coral reefs, kelp forests, and open ocean waters. Algae can also grow on rocks, sand, and other substrates on the ocean floor.
Lakes.
The type of large brown algae that grows from the ocean floor of the continental shelf and reaches upward toward the sunlit surface is called kelp. Kelp forms underwater forests that provide habitat and food for various marine species. These algae are vital for coastal ecosystems and can grow rapidly in nutrient-rich waters.
Because ocean plants need sunlight, most are either designed to float on the surface of the water, or grow on the ocean floor in water that is shallow enough to receive adequate sunlight. They also have adapted to salty water. Some are: kelp, seaweed. seagrass and algae.
Tiny plantlike organisms at the ocean surface, such as phytoplankton, require sunlight, nutrients like nitrogen and phosphorus, and water to grow. They photosynthesize using sunlight and take up nutrients dissolved in the seawater to support their growth. Temperature and currents also play a role in their distribution and growth.
If there is moisture available algae can grow in the desert.
If there is moisture available algae can grow in the desert.
Because their symbiotic algae are photosynthetic and require light and warmth from the sun.
The availability of sunlight is a major factor that limits where algae can be found in the open ocean. Algae rely on sunlight for photosynthesis, so they are usually found in the upper layers of the water column where light can penetrate. Nutrient levels and water temperature also play a role in determining the distribution of algae in the open ocean.
They can only live on the floor if there is enough light. If the algae is kelp, then it can grow long enough to reach light but still would have to be close to the light when small.
they canttt becasue there isn't enough nutrients and oxygen and no sunlight
Algae grows on any surface where it can get enough water and sunlight. Algae are plants, and make energy from sunlight. Some places you can find algae include your fish tank, the ocean, rivers and lakes, underneath rocks, on the shady side of your house, or inside of the toilet bowl. They are pretty much everywhere.