How Environments Change

Which shows how animals make lasting effects where they live?

• A beaver builds a dam
• A fish leaves ripples in the water
• A rabbit leaves tracks in the snow
• A bear eats all the berries off a branch

What will be a positive effect of a fire?

• Trees and plants will die
• Animals will leave this area
• Ashes will add nutrients to the soil
• Cabins will be desroyed

Which helps a plant during a drought?

• tall stems
• strong roots 
• small leaves
• colorful parts

If the place where an animal lives becomes crowded, the animal will

• have more children
• compete for food and water
• share food with other animals
• dhare shelter with other animals

Trees and plants need space for their leaves

• to get water from the soil
• to collect raindrops
• to get sunlight
• to get seeds for growing new plants

When there isn't enough space, animals sometimes

• move underground
• have to much food
• stop eating and drinking
• go into areas where humans live

Harmful chemicals dumped into the river cause

• flooding
• fish to die
• new plants to grow
• an increase in insects

Which of these is caused by human activities

• drought
• flood
• thunderstorm
• pollution

All organisms of the same kind that live in a certain area

• community
• ecosystem
• family
• population

Something found in nature that is useful 

• balance
• competition
• resource
• drought