The light intensity decreases with increasing depth of the ocean water. This leads to the division of the ocean into three major zones, sunlight zone, twilight zone, and deep sea zone. The autotrophs like the phytoplankton live in the sunlight zone and perform photosynthesis using sunlight. Various fishes that eat planktons also live in the sunlight zone. The twilight zone is inhabited by various predators like the octopus, sharks and dolphins. Here the pressure of water also is greater. In the deep sea zone, no light is present. Fishes like the angler fish and other bio-luminescent organisms live here. This zone also contains chemotrophs as the producer of food. The pressure of water at this zone is the greatest which is not bearable by the organisms living above it. Thus in this manner light and depth determine the distribution of various organisms in the ocean.
Answer: Both have chlorophyll and both have chloroplasts
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In biology, a mutation is the permanent alteration of the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA or other genetic elements.
What causes a mutation?
Acquired (or somatic) mutations occur at some time during a person's life and are present only in certain cells, not in every cell in the body. These changes can be caused by environmental factors such as ultraviolet radiation from the sun, or can occur if an error is made as DNA copies itself during cell division.
True!
The lac operon is responsible for transport and metabolism of lactose in enteric bacteria. It consists of structural genes, promoter, operator, regulator, and terminator. The operator is a segment of DNA to which some repressor proteins bind. These proteins prevent RNA polymerase from binding to genes and transcribing them. Thus, the operator controls RNA polymerase's access to lactose-metabolizing genes.