How living things change their surroundings

How does a beaver change a stream to meet its needs?

Submit: A labeled before/after drawing and oral or written evidence-based claim.

Related lesson: Needs of Living Things

This is a teacher-led extension beyond the short lesson. The task supplies a performance opportunity; completion alone does not certify mastery, full NGSS coverage or state alignment.

Build the idea

An environment includes the water, land and living things around an organism. Living things sometimes change those surroundings. A beaver may build a dam that slows a stream and makes a pond. Its home is a lodge, not the dam itself. The pond helps protect the lodge entrance. Not every beaver lives in a dammed pond; some use riverbank homes. Plants can also change a place: growing roots move soil as a plant reaches for water. People change places too, for example by building shelter.

Evidence and model inputs

Source cards, summarized from National Park Service accounts: (1) In Bering Land Bridge, beaver dams create ponds, and lodges provide shelter and protection. (2) In Zion, frequent river flooding makes dams less useful, and beavers use bank lodges with submerged entrances. These are different observed settings, not a rule that every beaver builds a dam.

Keep actual observations, published findings and invented model cases labeled separately. If a source or required equipment is unavailable, pause that part with a teacher; do not invent results.

Materials and preparation

Paper, crayons, source cards and optional adult-led observation from a safe path. Do not approach wildlife or alter a stream.

Grade-level scope

Assess an evidence-supported explanation of an organism changing its environment, not detailed ecosystem chemistry.

Do the work

1. An adult reads the two source cards. Draw water before and after a beaver builds a dam.
2. Label one change and connect it to a need: shelter or protection.
3. Compare the riverbank example. Explain why different places can have different homes.
4. Observe a safe plant example, such as visible roots lifting soil near a tree; draw the observed change without damaging the plant.
5. Add an adult-observed or teacher-photographed root-and-soil example. Draw what changed around the growing root and connect it to the plant getting water; compare it with a person building shelter. Keep these examples separate from the published beaver evidence.
6. Present one claim about a living thing changing its surroundings, with one source or observation that supports it.

Learner worksheet

Write on paper or type here and print. Entries stay in this page’s memory and are lost when you leave or reload; they are not saved or submitted.

Check your reasoning

1. Are a dam and a lodge the same structure?
2. What need can the pond help meet?
3. Do all beavers need to build a dam?
4. What makes “the beaver changes its environment” an argument?

Teacher review guide

Review the actual deliverable and discuss the reasoning. For each criterion, use 0 when evidence is absent or fundamentally incorrect, 1 when partly supported with a material error or omission, and 2 when accurate, supported and complete for the stated task. Maximum 8 points is a task score, not a proficiency certification. Give feedback and allow revision.

1. Identifies a real environmental change.
2. Connects that change to a need of the organism.
3. Uses evidence to connect an animal change and a plant change with a need, and discusses a human shelter example.
4. Recognizes that examples can differ instead of making an all-animals rule.

Sources and standard reference

• Official NGSS K-ESS2-2 performance expectation — inspect the practice, core idea, crosscutting concept and assessment boundary.
• NPS: Beaver, Bering Land Bridge
• NPS: American Beaver, Zion

Instructional text and hypothetical cases are original. Linked source readings supply published evidence where specified. Teachers should judge fit with their course and state requirements.