This series of modular kits allows students to build skills to ensure a complete understanding of the nature of science. The process skills and the nature of science work together to help students think and act like scientists. Students will develop their process skill of observation. Through the nature of science, students will learn that science knowledge is based upon evidence and that science knowledge can change based upon new evidence. Numerous opportunities are provided for students to complete hands-on explorations that ensure a thorough understanding of key science concepts. Each unit opens with a big question to guide learning. Throughout the unit, there are four levels of inquiry. The explore activity allows students to build background knowledge. Teachers direct instruction in directed inquiry. In guided inquiry, students become independent learners with guidance from the teacher. Students choose their own questions, create and carry out plans, collect and record data and share data in open inquiry.