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What is an ecosystem? And what are abiotic and biotic factors in an ecosystem?
What is an ecosystem? And what are abiotic and biotic factors in an ecosystem?
Organisms must adapt to their environments when the environment changes.
Organisms must adapt to their environments when the environment changes.
Ecosystems include producers, consumers and decomposers.
Ecosystems include producers, consumers and decomposers.
Food Chains
Food Chains
Play the Food Chain Challenge!
Play the Food Chain Challenge!
The arrows of a food chain always point in the direction of the transfer of energy.
The Carbon Dioxide Oxygen Cycle
The Carbon Dioxide Oxygen Cycle
Plants use carbon dioxide in a process known as photosynthesis. During photosynthesis, plants give off oxygen as a waste product. Carbon dioxide moves from the air into the leaves of plants through tiny openings in the plant’s leaves. Oxygen moves out of the plant leaf through these same openings.
All animals, including humans, require oxygen to survive. Animals breathe in the oxygen made by plants and breathe out carbon dioxide as a waste product. Even animals that live underwater need oxygen. These animals pass water over their gills to take in dissolved oxygen that is made by water plants. The water plants in turn take in the dissolved carbon dioxide from the water.
Animals and plants are connected to each other by the oxygen-carbon dioxide cycle. Plants need the carbon dioxide from animals to live and animals must have the oxygen from plants to survive.
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