Teaching AP Environmental Unit 2 - A Living World Biodiversity

         Hello Educators!

         Another unit down! I am excited for this one...

       Unit 1, The Living World: Ecosystems, was a doozy in the best way. It is big, content heavy, and foundational, with tons of vocab and intricate details, and those core ideas are the perfect anchor for the rest of the course. Now that students understand how abiotic and biotic factors shape ecosystems and how energy and matter move through them, we can zoom in on how those drivers impact the biodiversity of a place and why it changes over time.

       That being said, students usually enjoy Unit 2 (The Living World: Biodiversity) more than Unit 1. It is shorter and lighter on content. The content is more intuitive and big picture driven. As always, I aim for relevance and buy-in by creating mission-based storylines where students play a facet of an ecologist’s work. Within these aligned activities, they gather evidence, analyze patterns, and propose solutions like real environmental lawyers, paleoclimatologists, field ecologists, and island biogeographers. Expect more mission-based labs, more data to interpret, and more authentic problem solving that connects what they learned in Unit 1 to conservation decisions in the real world.

        Let’s break the activities down in lesson order...

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1. Introduction to Biodiversity: The Case of the Gopher Tortoise

Description:  Students act as environmental lawyers. They collect a biodiversity index for a site with gopher tortoises and a comparable site without them. Using their data, they build a persuasive case that the gopher tortoises at a new development site—along with the many animals that depend on their burrows—should be safely relocated before construction begins.

Justification: I used to run a parking-lot biodiversity index, but my school has new strict safety rules about leaving the classroom. I created this activity so students still calculate a biodiversity index (even though they won’t have to on the exam) and apply it to a real-world environmental problem. Instead of “counting cars,” they analyze their data to justify and propose solutions (real APES task verbs!) that connect invasives, keystone species, biodiversity, and ecosystem engineers. In a nutshell, it’s just way more aligned. 

Teaching-Tips: I recommend the digital walkthrough over the printer-friendly version. Present in slideshow mode so students can navigate with the built-in buttons.​
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Materials: Just the printed handout and access to computers. While I love hands-on activities too, this digital case study uses immersive visuals to create a sense of escape. That visual storytelling helps students buy into the mission and engage more deeply.​

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​2. Ecosystem Services: Nature's Bottom Line

• Description: Students become “Mother Nature” and move through two immersive case studies: a wildflower meadow converted to a sunflower-oil farm and a mangrove coast converted to shrimp ponds. Instead of matching terms, they log annual dollar amounts in a clean ledger for natural, sustainable, and unsustainable sites, then fast-forward five years to reveal the “damage receipts” when once-invisible services (pollination, soil formation, storm buffering, nursery habitat) disappear. They separate project/conversion revenue from true ecosystem services, record one example per category (Provisioning, Regulating, Supporting, Cultural), and compute the bottom line for Year 0 and Year 5.

Justification: Previously, students picked a national park and listed services or made a “thank-you” poster—too passive; many just Googled and copied. I wanted a mission-based storyline that centers a missing stakeholder: Mother Nature. This activity turns ecosystem services into a concrete balance sheet so students can see (via simplified numbers) the value of services and the costs of ignoring them for short-term gains. Along the way, they practice identifying services and explore two classic APES contexts: agricultural conversion and mangrove loss. Alignment GOLD.

Teaching-Tips: Students need computers. Keep the file in slideshow mode and instruct them to navigate only with the on-screen buttons, or they’ll get very lost.

Materials: Just the printed handout and access to computers. 

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​3. Natural Disruptions to Ecosystems: Operation Ice Core

​​Description: Students become paleoclimatologists and read layered ice like a time capsule. Using a simple, reusable pool-noodle model (or the no-prep paper version), they analyze a 10-layer “ice core” that includes CO₂ concentrations (blue bubble circles), volcanic ash bands, wildfire soot rings, and pollen. They plot CO₂, trace a temperature line, and identify when major events (eruptions, wildfires) occurred. Then they match their ice-core timeline to a photo of a nearby sediment core, using the fossil record in the sediment as a sea-level proxy to correlate inferred temperature with sea-level change.

Justification:  This lesson targets the suggested skill—data analysis: describing patterns and trends—while keeping the focus on Unit 2 essentials (long-term climate patterns over geologic time and climate proxies), not Unit 9’s emphasis on modern human impacts. The pool-noodle core replaces messy, melt-prone “make-a-core” labs (coffee/Pringles cans) with a low-prep, high-reuse model that students can handle directly. By interpreting multiple lines of evidence (gas bubbles, tephra/ash, charcoal, pollen) and linking them to inferred temperature, students practice authentic climate-science reasoning—spotting correlations, inferring cause/sequence, and telling the climate story from the data.

Teaching-Tips: Buy a pack of 6–8 white pool noodles and cut them in half to make 12–16 ice cores so students can work in pairs (smaller groups are always ideal). Each pool noodle takes about 10–15 minutes to make— not ideal, but they’re reusable year after year. For enrichment, flip over a huge cardboard box, cut holes, and have students “pull” the ice cores out of the “ground.” I used fake snow from my Christmas decorations to fill the space, but next year I’ll just glue on white computer paper.

Materials: to prepare the half pool noodles for students: white pool noodles (cut in half) and permanent markers (blue, orange, black, brown)

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​4. Adaptations - Galapagos Finch Beak Lab

Description: A fun twist on the classic beak-adaptations lab. Unlike many versions, students cycle through four distinct scenarios that highlight the delicate balance between an ever-changing environment and organismal adaptations.

Justification: This lab is grounded in the real-life work of the Grants (introduced in the pre-lab video). Students get to compete and “survive,” while also recognizing that plants, finches, and environmental conditions never stay static.

Teaching-Tips: Review the lab document about a week in advance to confirm materials. Sometimes the “plants” and “seeds” need a little tweaking so students generate clear data. I fit one group’s materials into a single 1-gallon baggie. It’s easy to pass around during the pre-lab video and cleanup. Then stash the baggies in a cupboard for next year. 😊

Materials per group of 3-4 students: 

• One student handout per student, One data table per group,
• Large Seeds: Large pom pom craft fluff balls or cotton balls (5/group
• Small Seeds: Small pony beads or beans (15/group)
• Skinny Seeds: broken popsicle sticks or toothpicks (15/group)
• 1 pair of chopsticks per group
• 1 clothespin per group
• 3 plastic spoons per group
• 1 plastic/paper bowl per group
• 3 test tubes or vials per group (I use plastic ones with a flat bottom). 

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​5. Ecological Succession: Island Hop Through Ecological Succession

Description: Students are field ecologists hopping from island to island in a volcanic hotspot chain, substituting space for time as each island serves as a natural “time machine” from youngest to oldest. Along the way, they map how soil develops and how communities assemble from bare rock, and they examine how disturbances can shift that path. On the back of the one-page worksheet, scaffolded, inquiry-based questions prompt them to think like real ecologists.

Justification: It’s hard not to default to the classic worksheet here—Google “ecological succession” and you’ll see the same diagram everywhere. Most worksheets have students cutting and gluing these identical plant-community pictures and answering basic recall questions. I put my thinking cap on: how could I create a mission-based storyline that feels different, especially when succession unfolds over hundreds of years? In this version, we swap time for space by centering the story on a volcanic hotspot, which also lets me weave in a Unit 4 concept. The idea came from this video (the quality isn’t good, but the explanation is excellent). Plus, the plant succession is on a tropical island, so the visuals feel fresh. On the back, I added scaffolded, inquiry-based questions to truly elevate this to an APES-level resource.

Teaching-Tips: The digital walkthrough is very short and optional, but having actual photos is still helpful (no AI images).

Materials: computers (optional but recommended), scissors, glue

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6. Island Biogeography - Island Biogeography Lab

Description: Students investigate (before formal instruction) how island size and distance from the mainland shape biodiversity. In a simple lab, they collect species-richness data across “islands” that vary in area and isolation, then compare patterns to infer the species–area relationship and the distance (immigration/extinction) effect.

Justification: Placed at the end of the unit, this lab pulls together the how and why of biodiversity. It shifts students from memorizing terms to reasoning like ecologists: making predictions, gathering evidence, and explaining patterns. The takeaways are actionable (bigger, closer, and better-connected “islands” (or habitat patches) support more specie) so it neatly ties earlier ideas (fragmentation, corridors, genetic diversity) into one coherent model. It’s engaging, low-barrier, and a satisfying finish.

Teaching-Tips: This lesson intentionally unfolds out of the usual order to preserve discovery. Teach the first half of the PowerPoint (it’s already split up for you), show the “From Ants to Grizzlies” video, run the lab and collect data, then return to finish the PowerPoint to formalize the model, and wrap with the post-lab analysis. 

Materials  per group: 

• Large poster paper or paper broken off from paper roll
• 100 pony beads (sub any type of bead)
• Ruler
• Black marker
• Funnels with opening large enough to fit pony beads (optional but recommended)

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Review Day/Wrapping up

I have 90 minute classes so I have students spend 45 minutes doing the unit 2 BOOM review (MUCH shorter than unit 1's) and then we watch Earthshot Prize (episode 1): Protect and Restore Nature

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