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Science 7 Final Review . Part A Unit 1 Interactions & Ecosystems. Unit 1: Interactions & Ecosystems. What are the 4 needs of living things?. Food, water, suitable habitat, gas exchange. What are adaptations? Example?.

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science 7 final review

Science 7 Final Review

Part A

Unit 1 Interactions & Ecosystems

unit 1 interactions ecosystems
Unit 1: Interactions & Ecosystems
  • What are the 4 needs of living things?

Inherited characteristics that help an organism survive and reproduce in their environment.

  • Example: long bill, robin’s feet, tiger’s stripes

Mutualism ex. Shark &

  • Commensalism ex. Orchid & tree trunk
  • Parasitism ex. Tapeworm & human
human impacts on ecosystems
Human impacts on Ecosystems
  • What are natural resources?

Need- must have it to survive

  • Want- a luxury you could live without
environmental choices
Environmental choices
  • What is an ecological footprint?


  • Reuse
  • Recycle
interactions of organisms
Interactions of Organisms
  • What is the difference between Abiotic and Biotic?

Abiotic- non-living

  • Biotic- living

A food web is more complex than a food chain

  • A food chain starts with a producer

Producers- produce food energy for themselves

  • Consumers- eat food made by consumers
  • Decomposers- break down dead or waste material

All are consumers

  • Herbivores only eat plants
  • Omnivores eat plants and animals
  • Carnivores only eat animals

Shows the biomass or number of organisms at each level of the food chain. Producers form the base.


Scavengers eat dead or decaying plants or animals

  • Decomposers live inside dead or decaying plants or animals

The different types of harmful materials that are released into the environment through human activities


The movement of pollutants through levels of a food chain so that greater quantities are retained with movement up the food chain

changes in the ecosystem
Changes in the Ecosystem
  • How does primary succession differ from secondary?

Primary is from bare rock

  • Secondary from where there was organisms before
  • What are the 4 types of ecosystem monitoring?


  • Environmental
  • Chemical
  • Biological

Manipulated- variable you change

  • Responding- what happens as a result of the experiment
  • Controlled- keep the same throughout the experiment