En anglais

How living things change their home

Science · Earth's Systems · ages 5-6

Name ______________________ Date ____________

Why do many birds gather twigs to build a nest?
- To store a supply of food for winter
- To hold their eggs and chicks
- To collect rainwater for drinking
Which animal piles wood and mud across a stream to build a dam?
- Beaver
- Bird
- Rabbit
A tree root is a whole tree on its own.
Circle one: True False
A bird builds a nest. Wind moves a leaf. A beaver builds a dam. How many of these changes are made by living things?
Answer: ______________
How can a beaver's dam make a pond behind it?
- It speeds up the flow so water rushes away
- It lets all the water pass without slowing
- It slows the flow so water collects
A tree root grows thicker inside a crack in rock. What change can this cause?
- The crack can become wider
- The crack must stay the same width
- The crack must close as the root thickens
A desert fox digs a burrow where it can hide and rest away from heat. Which need does this change help meet?
- A supply of food for hungry days
- A supply of water for dry days
- Shelter from heat and danger
Ana watches a bird carry grass into a nest. Later, she sees eggs in it. Which explanation connects the bird's change, its need, and Ana's clues?
- The bird made a food store for winter; Ana saw grass carried to the place where eggs were laid.
- The bird built a nest to hold eggs; Ana saw it carry grass there and later saw eggs.
- The bird made a place to collect drinking water; Ana saw grass carried there and later saw eggs.

Answer key

For grown-ups. Fold this page away before handing over the rest.

To hold their eggs and chicks · Many birds build nests as places for their eggs and chicks. This is different from storing food or collecting drinking water.
Beaver · A beaver builds a dam with wood and mud. The dam slows flowing water.
False · A root is one part of a tree. The tree is the whole living thing.
2 · The bird and beaver make two changes. Wind is not a living thing.
It slows the flow so water collects · A dam slows the flow, allowing water to collect behind it. Some water can still flow past the dam.
The crack can become wider · A thickening root takes up more space and can push the sides of an existing crack apart.
Shelter from heat and danger · The described burrow provides shelter: a place to hide and rest away from heat. The question gives no evidence of food or water stored there.
The bird built a nest to hold eggs; Ana saw it carry grass there and later saw eggs. · The bird built a nest to hold eggs. Ana saw it carry grass there and later saw eggs in the nest. These clues support that explanation, not food storage or water collection.