A-Level Biology (AQA)

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Organisms respond to changes in their internal and external environments Stimuli, both internal and external, are detected and lead to a response

The Retina

9:16 Receptors
Spec 3.6.1.2
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questions for Stimuli, both internal and external, are detected and lead to a response

This video covers the following point of the AQA specification.

Specification reference