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Life ScienceChapter 17
Relationships Among Organisms
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Relationships
•Benefit
Twig ants live in trees and eat the acacias that typically destroy plants.
One organism only
Both organisms
Many organisms at once
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Biomass
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The dried mass of the living matter in a given area of habitat
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Ecological Pyramids
Note that only a small portion of energy is passed upward to the next level.
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trophiclevels
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What’s the problem with ecological
pyramids?
• Only useful for food chain
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What’s the problem with ecological
pyramids?
• omnivores
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Other problems with the pyramid
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Fire Ants Make a Living Raft
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Competition within Populations
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Competition within Populations
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Competition between Plants
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Facets of Life Science: Dressed For
Success
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Camouflage
Warning Coloration
Mimicry
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Competition Between Populations
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Predator-Prey Relationships
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