Free Printable WorksheetScienceGrade 7Science CurriculumSCI.7.39

7.39 Ecosystem Stability and Change Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 7 Science worksheet provides structured practice on 7.39 Ecosystem Stability and Change. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Ecosystem Stability and Change - Which claim about population change is best supported by the evidence after a disturbance? (NGSS MS‑LS2‑4)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 7

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 7.39 Ecosystem Stability and Change skill assessments:

Problem 1Difficulty: Mastery

Which claim about population change is best supported by the evidence?

AThe evidence proves milkweed increased because bobcats decided to stop eating earthworms.

BThe evidence supports that the disturbance was followed by a change in dissolved oxygen (mg/L) and a decline in earthworms and ('bobcats',) while milkweed increased at first.

CThe evidence shows dissolved oxygen (mg/L) stayed constant, so any population changes must be measurement error.

DThe evidence proves the disturbance did not matter because populations changed later anyway.

Solution & Explanation:Use the table: right after the disturbance, dissolved oxygen (mg/L) changes from 9.7 to 5.1. milkweed rises 62→112, while earthworms drops 58→20 and bobcats drops 21→10. A best-supported claim reports those patterns without adding untested reasons.

Problem 2Difficulty: Mastery

Which claim about population change is best supported by the evidence?,A. The evidence proves the disturbance did not matter because populations changed later anyway. | B. The evidence supports that the disturbance was followed by a change in dissolved oxygen (mg/L) and a decline in honeybees and ('bass'

A) while pond lilies increased at first.

BThe evidence shows dissolved oxygen (mg/L) stayed constant

Solution & Explanation:dissolved oxygen (mg/L) changes from 7.9 to 2.8. pond lilies rises 107→192

Problem 3Difficulty: Mastery

Which claim about population change is best supported by the evidence?

AThe evidence proves the disturbance did not matter because populations changed later anyway.

BThe evidence proves young pine seedlings increased because weasels decided to stop eating field voles.

CThe evidence supports that the disturbance was followed by a change in canopy cover (%) and a decline in field voles and ('weasels',) while young pine seedlings increased at first.

DThe evidence shows canopy cover (%) stayed constant, so any population changes must be measurement error.

Solution & Explanation:Use the table: right after the disturbance, canopy cover (%) changes from 73.0 to 35.0. young pine seedlings rises 25→52, while field voles drops 26→39 and weasels drops 49→54. A best-supported claim reports those patterns without adding untested reasons.

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Frequently Asked Questions

Common questions about printing, using, and solving this worksheet

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QCan students practice 7.39 Ecosystem Stability and Change online with instant feedback?

Yes! In addition to this printable worksheet, students can practice 7.39 Ecosystem Stability and Change interactively on our platform with automated grading, instant score tracking, and detailed step-by-step solutions.

QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 7 Science students. It aligns with educational standard SCI.7.39 (Grade 7 science practice focused on ecosystem stability and change.).