A Bridge for the Wild

About this resource

Near Los Angeles, a giant new bridge crosses a 10-lane freeway. It is covered in soil and native plants, and no car or person will ever drive across it. Why spend more than $100 million on a bridge for wildlife — and is it the best design to save the area’s mountain lions? Biodiversity keeps ecosystems healthy and working for us — and the best designs protect both. In this one-week, 5-level Biodiversity & Ecosystem Services Design unit for middle school science (NGSS MS-LS2-5), students investigate a real mystery, then use their evidence to crack the case.

A Bridge for the Wild is part of Science Unlocked, a series of mystery-driven lesson sets. Every set opens with a real, surprising phenomenon, builds the science one level at a time, and ends with students solving the mystery in a claim-evidence-reasoning (CER) write-up.

Topics: ecosystems, claim evidence reasoning (CER), science phenomenon, review games.

What's included

• Teacher Deck (83 slides, PowerPoint). Answers are highlighted on the slides. Speaker notes tell you what to say and do, what to watch for, and how to support students or push GT students further. Prep slides and answer keys are hidden, so they skip during a slideshow.
• Interactive Student Deck (51 slides, PowerPoint + PDF). Students type in boxes, drag cards and check marks, and rate their confidence. Assign one copy per student in Google Classroom or your LMS.
• Google Slides versions of both decks. Click a button in the Google Slides Links PDF to make your own copy in Google Drive.
• Teacher Guide (24-page PDF). The standard, a week at a glance, a materials list, misconceptions to watch for, a run-of-show for every level, answer keys and sources.
• Student Printable (16-page PDF + a low-ink greyscale copy). The same tasks on paper in 12 pt type, for students without devices, sub days, or anyone who learns better with a pencil. Slide numbers match the Student Deck.
• Self-grading digital activity. SCORM 2004 and SCORM 1.2 packages for an LMS that accepts SCORM uploads, a web package, and a single HTML file that opens in any browser. Notes, sorts, matches, tables and multiple-choice items grade themselves, and students get a copy-and-paste backup of their work. A 2-page teacher quick start is included.
• Two whole-class review games that open in any browser: a Jeopardy-style game (6 categories, 30 clues) and Trashketball, where teams answer on whiteboards and then shoot for points.
• Kahoot! and Blooket import files. 48 review questions, one file per level plus an all-levels file, with a printable answer key.
• Start Here guide, HTML & SCORM how-to guide and Terms of Use, so you know which file to open first.

The 5 levels (about one 45–50 minute class each)

1. Variety Is Life. Biodiversity, ecosystem health, habitat fragmentation. Key activities: Crossing mystery, camera-trap data table, P-22 case file.
2. Nature’s Free Services. Ecosystem services, NYC forest vs. filtration plant. Key activities: Service match, compare two real designs.
3. Erosion Showdown Lab. Agree on criteria, test 4 erosion-control designs. Key activities: Bottle-hillside lab, data table.
4. Judge the Designs. Scientific, economic, social constraints, decision matrix. Key activities: Lab Conclusion CER, constraint sort, weighted decision matrix.
5. Crack the Case. Stretch HS-LS2-7: design leads to evaluate leads to refine. Key activities: Label the bridge, Stretch CER, final crossing CER.

Built for real classrooms

• Every level follows the same routine: "I can" targets with a confidence check, a warm-up, copy-it notes with a word bank, hands-on practice, a checkpoint students must pass to unlock the next step, and an exit ticket. A 10-item Mini Quiz wraps up the week.
• Level 1 opens with a Power-Up on the earlier-grade ideas this standard builds on (2-LS4-1, 2-ESS2-1, 3-LS4-4, 3-5-ETS1-2).
• The last level includes a high school Stretch (HS-LS2-7) that every student tries and advanced students can take further.
• Hands-on lab (Erosion Showdown: The Test). Student materials list: 4 bottle hillsides (A–D), same soil, same depth; A stack of books under each bottle (same tilt); Rain cup (paper cup with holes), 500 mL water; 4 clear cups (same size), measuring cup, metric ruler; Muddiness card (1 clear leads to 5 chocolate milk). Safety notes are on the slides and in the Teacher Guide.
• Support is built in: word banks, sentence starters and support notes on the slides, plus GT extensions.

Standards

• NGSS MS-LS2-5: Evaluate competing design solutions for maintaining biodiversity and ecosystem services.
• SEP: Engaging in Argument from Evidence · DCI: ETS1.B, LS2.C, LS4.D · CCC: Stability and Change
• Stretch: HS-LS2-7
• CCSS connections: 6.RP.A.3, MP.4, RI.8.8, RST.6-8.8

Try the digital activity first

• Not sure the self-grading activity will work in your LMS? Download the FREE HTML & SCORM Sample and test it with your students before you buy.

Save with a bundle

• Ecosystems (5 sets)
• Middle School Life Science (21 sets)
• Science Unlocked Mega Bundle (all 89 sets)

Teach next

• Boom and Bust (MS-LS2-1)
• Open Wide (MS-LS2-2)
• The Salmon Forest (MS-LS2-3)
• The Vanishing Kelp Forest (MS-LS2-4)

More from Mystery Lab Learning

• See every Science Unlocked set, and follow to hear when new ones are added, at Mystery Lab Learning.

Good to know

• The illustrations in this resource were created with AI image tools, and AI tools helped draft the lesson text. Every slide, answer key and lab step was then fact-checked against the sources listed in the Teacher Guide and proofread.
• Kahoot!, Blooket, Jeopardy!, Google Slides and PowerPoint are trademarks of their owners. This resource is not affiliated with or endorsed by them.
• License: one teacher, for use with their own students. Please buy an additional license for each colleague who uses it.