Aquatic plants are able to absorb the carbon dioxide (CO2) they need to make food directly from the water around them through their leaves, just as land plants obtain carbon dioxide from the air. The water provides the n... More »

A person can breathe underwater by using a snorkel or a scuba tank and regulator. Some people train themselves to hold their breath for long periods of time for freediving. Those who freedive use no external breathing su... More »

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Alligators actually don't breathe underwater. Though they can stay submerged for long periods of time, they must eventually surface to breathe through the nostrils on their long snouts. More »

The primary function of the Calvin cycle is to convert carbon dioxide in the air into sugar, which plants and algae use as food. Plants depend directly on the Calvin cycle for the energy they need to grow and reproduce. ... More »

Plants produce food in their leaves through photosynthesis, a process that uses chlorophyll to synthesize sustenance through carbon dioxide, sunlight, water and mineral-related nutrients. Chemical energy from photosynthe... More »

Respiration, in which energy is released from carbohydrates for metabolic needs, takes place in plants through a process which can be expressed in a word equation as: glucose + oxygen = energy + carbon dioxide + water. T... More »

During photosynthesis, plants make glucose and oxygen from carbon dioxide and water. To do this, they need energy in the form of light from the sun. While plants use glucose as energy, oxygen enters the atmosphere for us... More »