8th Grade Science

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8th Grade Science

• Unit 6
• Heredity and the Environment
• Traits and the ecosystem
• Lesson 1
• Interdependency in Ecosystems
• Vocabulary of instruction

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1. 10 Rule

• Approximately 10 of the energy (food) entering
  one trophic level passes to the next trophic
  level.

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2. Commensalism

• Is a type of symbiotic relationship between two
  biological species in which one species benefits,
  and the other species neither benefits nor it is
  harmed by the relationship.

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3. Energy pyramid

• A diagram that shows how the energy is used up as
  it travels through food chains in an ecosystem.
• It shows how the amount of energy is decreasing
  and becoming less available for organisms as it
  enters each trophic level.

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4. Mutualism

• Is a form of symbiotic relationship in which two
  different biological species live together and
  both of them benefit from such relationship.

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5. Parasitism

• Is a type of symbiotic relationship between two
  biological species in which one species benefits
  and the other is harmed.

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6. Symbiosis

• A close relationship between two different
  organisms living together where both are affected
  by relationship.

Symbiosis in action.