How Animals and Plants Change Over Time

Active learning works for this topic because students need to see evolution as a process of changing populations, not individual changes. Hands-on simulations and discussions make abstract concepts concrete, helping students move beyond words like 'adaptation' to understanding the mechanisms behind them.

• 6th Year
• The Living World: Foundations of Biology
• 3 activities
• 20 min–45 min

Learning Objectives

1. Analyze fossil evidence to explain how specific traits in extinct organisms aided their survival.
2. Compare the adaptations of different species living in similar environments, explaining the role of selective pressures.
3. Explain how genetic variation within a population influences its ability to adapt to environmental changes.
4. Classify organisms based on homologous structures, inferring common ancestry and evolutionary relationships.
5. Evaluate the impact of human-induced environmental changes on the evolutionary trajectory of selected species.

Simulation Game

⏱ 45 min·Small Groups

Simulation Game: The Beaks of Finches

Students use different tools (tweezers, spoons, clips) to 'feed' on various 'seeds' (beads, rice, beans). Over several 'generations,' they track which 'beak' types survive and reproduce based on the available food source, graphing the change in the population.

Prepare & details

How do animals and plants change to survive in different places?

Facilitation Tip: During the Beaks of Finches simulation, circulate and ask students to explain why a particular beak type was 'selected out' in a given environment.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Antibiotic Resistance

Provide a scenario about a patient who stops taking antibiotics early. Pairs must explain, using the steps of natural selection, how this leads to the rise of 'superbugs' and then present their explanation to another pair.

Prepare & details

What can we learn about the past from looking at old bones or plant prints?

Facilitation Tip: For the Antibiotic Resistance Think-Pair-Share, assign roles: one student explains the mechanism, the other finds flaws in the 'perfection' misconception.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Gallery Walk

⏱ 30 min·Small Groups

Gallery Walk: Selective Pressures

Display images of diverse Irish species (e.g., the Red Squirrel, the Connemara Pony). Students move in groups to identify the specific environmental pressures that likely shaped the unique adaptations of each organism.

Prepare & details

Why do some animals have features that help them hide?

Facilitation Tip: In the Gallery Walk on Selective Pressures, place a timer at each station to keep the energy high and ensure all students contribute.

Setup: Wall space or tables arranged around room perimeter

Materials: Large paper/poster boards, Markers, Sticky notes for feedback

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Teaching This Topic

Start with simulations to confront misconceptions directly, then use peer discussion to challenge assumptions about 'perfection' in evolution. Avoid framing evolution as a forward-moving process; instead, emphasize that changes depend on current environmental pressures. Research shows students grasp natural selection best when they see it as a filter, not a goal.

What to Expect

Successful learning looks like students explaining how traits change in a population over time rather than describing individual changes. They should use terms like variation, selective pressure, and reproductive advantage to analyze real-world examples.

Watch Out for These Misconceptions

Common Misconception

During the Beaks of Finches simulation, watch for students claiming a finch 'changed its beak' during the activity. Redirect by asking, 'What happened to the proportion of different beak types in the population after each round?'

What to Teach Instead

During the Beaks of Finches simulation, clarify that the population changed, not individual finches. Have students track the number of each beak type in the population before and after each round to show the shift in traits.

Common Misconception

During the Antibiotic Resistance Think-Pair-Share, watch for students suggesting bacteria 'learn' to resist antibiotics. Redirect by asking, 'Which bacteria survived the antibiotic treatment, and why?'

What to Teach Instead

During the Antibiotic Resistance Think-Pair-Share, emphasize that resistant bacteria were already present and survived to reproduce. Use the activity’s data table to highlight how the proportion of resistant bacteria increased over generations.

Assessment Ideas

Quick Check

After the Beaks of Finches simulation, present students with two images of animals in the same environment. Ask them to identify one structural adaptation for survival and one behavioral adaptation for avoiding predators, collecting responses to check understanding of adaptation as a population-level trait.

Discussion Prompt

After the Gallery Walk on Selective Pressures, pose the question: 'If a new predator was introduced to Ireland, what changes might we expect in the prey population over many generations?' Guide students to use terms like variation, selective pressure, and survival advantage in their responses.

Exit Ticket

During the Antibiotic Resistance Think-Pair-Share, provide a short description of a fossil find (e.g., a fossilized leaf imprint). Ask students to write two sentences explaining what this fossil tells us about the past environment and one way this organism might have been different from its modern descendants.

Extensions & Scaffolding

• Challenge students to design their own simulation showing how a new selective pressure (e.g., pollution) might affect a local plant population.
• For students who struggle, provide a word bank of key terms (variation, competition, adaptation) and a partially completed data table for the Beaks of Finches activity.
• Deeper exploration: Ask students to research a real Irish species that has evolved due to human activity (e.g., peppered moths in polluted areas) and present findings to the class.

Key Vocabulary

Adaptation	A trait or characteristic that increases an organism's ability to survive and reproduce in its specific environment. Adaptations can be structural, physiological, or behavioral.
Natural Selection	The process whereby organisms better adapted to their environment tend to survive and produce more offspring. This is a key mechanism of evolution.
Fossil Record	The preserved remains or traces of ancient organisms. Fossils provide direct evidence of past life and how organisms have changed over geological time.
Homologous Structures	Body parts in different species that have a similar underlying structure due to shared ancestry, even if they have different functions. For example, the forelimbs of humans, bats, and whales.
Speciation	The evolutionary process by which new biological species arise. It often occurs when populations become reproductively isolated from each other.