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9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

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Page 1: 9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

9/18/14

Objective: How do living things get their energy?

Do Now:

Recall the levels of organization, what is an ecosystem?

Page 2: 9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

Ecology

• ecology: the interactions between organisms and their environment

• Biotic factors: all of the living things

• Abiotic factors: non-living conditions

Page 3: 9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

Types of organisms

• Producers (autotrophs): make their own food– Energy from the sun

• Consumers (heterotrophs): eat other organisms for energy– Herbivores: eat plants– Carnivores: eat animals– Omnivores: eats both

plants and animals– Decomposers: break down

remains of plants and animals

Page 4: 9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

Food Chains• Draw the Arrows:

Grass Insect Bird Fox

Where does the initial energy come from?

How does each organism obtain their energy?

This is a food chain

A food chain is a sequence in which energy is transferred from one organism to the next as each organism eats another organism

Page 5: 9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

Food Webs

• Food webs are interconnected food chains that show many feeding relationships

hawk

Bird snake

mouse insect

seeds grass

- The arrows show the FLOW OF ENERGY

Page 6: 9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

Food WebsEnergy flows

in one direction. Which direction?

Energy flows from producers to herbivores to carnivores to decomposers

Page 7: 9/18/14 Objective: How do living things get their energy? Do Now: Recall the levels of organization, what is an ecosystem?

Factors that affect stability

- Food webs more stable than food chains

- Removing or adding organisms can be harmful to the stability


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