WEBVTT

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JOAN CARTAN-HANSEN,

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HOST: AN ANIMAL NEEDS FIVE

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THINGS TO SURVIVE IN ITS HABITAT

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AND ONE OF THEM IS FOOD.

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THE FLOW OF ENERGY FROM ONE

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LIVING THING TO ANOTHER IS

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CALLED A FOOD CHAIN.

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FOOD CHAINS COMBINE TO CREATE A

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FOOD WEB.

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AND IT ALL STARTS WITH THE SUN.

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PLANTS USE THE SUN AND RESOURCES

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FROM THE SOIL TO MAKE FOOD AND

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GROW.

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HERBIVORES CONSUME PLANTS AND

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ARE, IN TURN, EATEN BY

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CARNIVORES.

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THEN WHEN PLANTS AND ANIMALS

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DIE, DECOMPOSERS BREAK DOWN

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THEIR COMPONENTS AND RETURN

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RESOURCES TO THE SOIL.

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AND THE WHOLE PROCESS STARTS

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OVER AGAIN.

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BUT IF THERE'S A MAJOR CHANGE IN

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A HABITAT, LIKE A NATURAL

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DISASTER, EXCESSIVE HUMAN

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ACTIVITY, EVEN A SINGLE SPECIES

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GOING EXTINCT, THEN THE FOOD WEB

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CAN BREAK AND THAT CAN RUIN

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EVERYBODY'S HABITAT.

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SO, TO BE HEALTHY, A HABITAT

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NEEDS A STRONG FOOD WEB.

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FOR MORE INFORMATION ABOUT

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HABITATS, AND FOOD WEBS AND

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OTHER SCIENTIFIC TOPICS FOR

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KIDS, CHECK OUT THE SCIENCE TREK

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WEBSITE.

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YOU'LL FIND IT AT

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IDAHOPTV.ORG/SCIENCE TREK

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