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It helps to move the blood from the lungs to heart.
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The simplest definition of an ecosystem is that it is a community or group of living organisms that live in and interact with each other in a specific environment.
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The habitat is the physical area where a species lives.Many factors are used to describe a habitat...A habitat is the actual place of the ecosystem,whereas the ecosystem includes both biotic and abiotic factors in habitat
A cladogram (from Greek clados "branch" and gramma "character") is a diagram used in cladistics to show relations among organisms. ... These branching off points represent a hypothetical ancestor (not an actual entity) which can be inferred to exhibit the traits shared among the terminal taxa above it.
