Their challenge ..... to build a seed that simulates a seed that sticks to animal fur/hair, and to build a seed that simulates a seed blowing into the wind. They must brainstorm, draw designs, build the design with pre-determined materials, and test/measure their designs, and graph their results, all while working together cooperatively in a group. By the end of the project, students should have a deeper understanding of what makes a seed become successfully disbursed throughout the ecosystem.
Here's a photo of one seed a group built, it must stay attached to a cotton-flannel cloth for a minimum of 30 seconds to be considered a high-quality/successful build:
