ER Chapter 3 Homework Review

What does healthy soil look like?

• It is made up of one substance.

• It is made up of many substances including living organisms.

• It looks dry.

• It looks sabdy.

What makes up health soil?

• Everything in the environment can become part of soil.

• decomposed plants

• decomposed animals

• pebbles and sand

Organisms that break down dead matter.

• decomposers

• nutrients

• energy

• carbon dioxide

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How do decomposers help keep an ecosystem healthy.

• Decomposers release nutrients from dead plants and animals into the soil.

• Decomposers provide energy for plants to make their own food,

• Decomposers provide water molecules for other organisms.

• Decomposers provide food molecules for other organisms.

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Animals, plants, and decomposers ​ (a)   by changing ​ (b)   molecules into ​ (c)   molecules that can build their bodies.

• grow
• food
• body
• nutrients
• energy

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Animals, plants, and decomposers use some food molecules to release ​ (a)   for movement and ​ (b)   .

• energy
• growth
• nutrients
• carbon dioxide

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Plants do not make enough ​ (a)   molecules to grow and thrive when they don’t have access to the ​ (b)   they need.

• food
• nutrients
• energy
• matter

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Why aren’t the cecropia trees growing and thriving in the project area?

• There are not enough decomposers in the soil.

• There is not enough carbon dioxide in the environment.

• The trees are not receiving enough sunlight.

• The trees are not receiving enough water.

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What does the Data from the Project Report tell us?

• The differences between the Project Area and the Healthy Rain Forest are insignificant.

• There is not enough sun in the Project Area.

• There is not enough rain in the Project Area.

• There is not enough carbon dioxide in the Project Area.

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What do plants need to make their own food?

• carbon dioxide and water

• carbon dioxide, sunlight, and water

• water and sunlight

• water

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