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Biogas

Part 2 Biology Revision Notes for AQA GCSE A/A*

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B3.3 Keeping internal conditions constant 3.1 Controlling internal condition Keeping the conditions in the in the body within a narrow range is called homeostasis. Temperature, blood glucose, water and ion content and levels of waste products must all be controlled Waste products that have to be removed include; CO2 (produced by respiration) removed by the lungs urea (produced in the liver when amino acids are broken down) removed by the kidneys and temporarily stored in the bladder Water and ions enter the body when we eat and drink. If the water or ion content in the body is wrong, too much water may move into or out of the cells. This could damage or destroy the cells 3.2 The human kidney

Biomass Powerpoint

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Biomass ? Organic Matter One of our oldest energy sources. Gets energy from the sun-photosynthesis Renewable Three types are used today Wood and agriculture products Solid Waste Landfill gas and biogas What is it? ? How Does it Work? ? Mainly used for Electricity - 14% Heat- 1/10th of homes Fuels - 15% Industrial - 55% What Does it Do? ? Can be sustainable Paper and saw mills But? Like anything can be overused Cost How Realistic is it? ? Promising Comes from many different sources Usually our waste Can be used for a lot Has a few disadvantages Releases carbon dioxide Future? ? What is the purpose that biomass is used for the most? Where does biomass get its energy from? Is biomass better environmentally and economically than coal? How?
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