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2.1 Activity أفكار 2.2 Did you know that humpback whales sing underwater to communicate with each other? These whales أفكار 2.3 continue, Technology Inspired by Nature أفكار 2.4 The eyes pupils of them usually open wider than ours, letting in more light. Many nocturnal أفكار 2.5 | Material | Observations | Is this what you expected to happen? أفكار 2.6 How does light striking matter make it possible for animals, including humans, to see? Light أفكار 2.7 To plan your scientific explanation, first write you claim أفكار 2.8 What Is the Relationship between Speed and Kinetic Energy? أفكار 2.9 What do we observe when objects collide? أفكار 2.10 Does Energy Disappear in a Collision? أفكار