Read a changed habitat

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper, drawing space or a browser document.
• Reference card A: organisms move to another place. Reference card B: fewer organisms remain locally.
• Assessment case 1: Which scientific label fits the specifically described step or feature? Supplied case: Tagged birds move elsewhere.
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Matched local counts fall.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Species stays in repeated local records.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Only a before-change picture exists.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Tracked fish move to a new stream.
• Assessment case 6: Which scientific label fits the specifically described step or feature? Supplied case: No after-change observations are supplied.

Learn the idea

A changed environment may remove resources or alter conditions. Distinguish migration, local population decrease, local persistence and lack of evidence in the supplied records.

Migration means organisms move to another place. Decrease means fewer organisms remain locally. Persistence means organisms continue locally. Unknown means no follow-up count or location.

For migration, look for the clue “organisms move to another place.” For decrease, look for “fewer organisms remain locally.” More than one process can happen in a real situation. Answer about the one described in this question.

1. Read or listen to the four science words and what each means. Say how the first two differ.
2. Choose two of the short cases. Point to the clue that helps you choose a science word for each one. You may draw or say your answer.
3. Answer each practice question. Say which clue helped you, then check the explanation.
4. Use the extra task to make two examples that show different science words. Draw or say what makes each one fit.

Check your reasoning

Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.

Take it further

Create one new case showing migration and one showing decrease. Expected: the first explicitly shows “organisms move to another place”; the second explicitly shows “fewer organisms remain locally.” Explain the distinction by drawing, speaking or writing. A label without a matching feature is incomplete.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.