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Nervous System: Neuron, Impulse, and Synapse

Explore threshold firing, action potentials, refractory period, myelin-driven speed, and synaptic signal transfer.

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Explore artificial selection: choose parents by traits, produce offspring, and watch a new breed form across generations.

Understand school-level animal classification: vertebrates and invertebrates, major groups, key traits, habitats, and lifestyles.

Understand how bacteria, fungi, and lichens differ in structure, habitat, nutrition, and role in nature.