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GCSE Biology Meiosis - Online course
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...As meiosis begins, the chromosomes start to become visible. At this stage they have produced replicas of each other. The centrioles separate and move to opposite poles (ends)... More


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GCSE Biology Mitosis - Online course
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...The chromosomes are clearly visible. They each consist of two threads called chromatids, each an exact copy of the parent chromosome. Chromatids are joined... More


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GCSE Biology Life Processes - Online course
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...need minerals from the soil. Excretion Waste products must be... Movement Animals move to find food and away from predators and plants move towards light... More


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GCSE Biology Cells / Tissues / Organs - Online course
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...Protoplasm Consists of cytoplasm and nucleus. Cytoplasm Jelly like substance where chemical reactions take place and other parts are embedded... More


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GCSE Biology Genetic Terminology - Online course
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...DNAThe molecule which contains genes. It's shaped like a double helix (a spiral) Chromosomes Found in the cell nucleus: X- shaped things made up of... More


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GCSE Biology Diffusion - Online course
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...Diffusion is the seemingly random movement of a substance from where these particles are in high concentration to where there are fewer. The diffusion... More


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GCSE Biology Pollution - Online course
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...main sources of water pollution: See also:Leaching / Eutrophication The impact of human activities on the earth has become noticeable and significant during... More


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GCSE Biology Leaching / Eutrophication - Online course
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...Leaching describes the "washing out" from soils any soluble chemicals that are not "bound" to the soil particles. It occurs as excess... More


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GCSE Biology Brain / Nervous System - Online course
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...1. Cerebrum- (consisting of the two cerebral hemispheres) A small part of the cerebrum determines what we hear. Another section interprets what we... More


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GCSE Biology Neurone Structure - Online course
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...the nerve impulses (at the left of diagram above). Synapses are... Sensory Neurone The nerve impulses travel from left to right in this diagram of a sensory neurone... More


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