Make pathogens and the body's defense systems come alive for young biologists in a hands-on activity. Investigators model the skin's protection against infection by observing and comparing changes in a punctured tomato and an intact tomato. The lesson provides an opportunity for class members to engage in a post-activity group discussion.

Concepts

the immune system, pathogens, skin, microorganisms, bacteria, covid-19

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Instructional Ideas

• Ask participants to write a hypothesis before testing
• Create a word splash with relevant vocabulary to help scholars connect concepts 
  

Classroom Considerations

• Make allowances for pupils with food allergies
  
• Gather materials and prepare the learning space ahead of time
  

Pros

• Adaptable for remote learners
• Includes opportunities to extend learning

Cons