In this unit, students will investigate what plants need to live, grow, and reproduce, and how these factors are parts of a system that work together in each plant’s habitat. Throughout the module, students will be aiming to understand an overarching phenomenon: Why is the number of grand spider orchids in Western Australia decreasing? They begin by asking questions about what makes a good habitat for a plant and observing how different plant parts have structures that relate to their function in helping the plant thrive. Students collaboratively plan and carry out investigations about whether plants need water and/or light to grow.