Learning objectives: -Distinguish between nervous and hormonal co-ordination -Describe the structure of a myelinated motor neuron -Describe the different types of neuron. This is for the AQA A-level biology specification: Unit: 3.6 Organisms respond to changes in their environment

Learning objective: Explain how terrestrial plants and insects balance the need for gas exchange and the need to conserve water Includes summary questions, quiz and exam questions w/ MS.

For AQA A-level (oxford) Learning objective covered: Describe the structure of fish gills Describe how water is passed along fish gills Explain the difference between parallel flow and countercurrent flow. Explain how countercurrent flow increases the rate of gas exchange