Or microbe, is an organism too small to be seen by the human eye.
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The cycle of events involved in normal cell growth and division, in multicellular organisms.
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A reproductive cell, such as a sperm or egg cell.
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The process by which cells can divide to produce two genetically identical cells.
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The building blocks of proteins and polypeptides.
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The fusion of two sex cells to create a new organism.
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A genetically identical copy of a piece of DNA, or an entire organism.
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A collection of cells in an organism that have similar appearance, structure and function.
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Animals with bony spinal columns or backbones, a spinal cord, and a skull enclosing the brain and eyes.
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Another word for fertilisation - when two sex cells combine to create a new organism.
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The total mass of living organisms in an area or ecosystem.
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The maintenance of a stable internal environment.
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Alternative forms of a gene, which affect the expression of a particular trait, such as eye colour or blood type.
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The stage of development an organism goes through inside the womb, following the initial development of the embryo.
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Any organism that gets its energy by consuming other organisms.
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An organism that can make its own food, being able to produce complex organic compounds, such as proteins and carbohydrates.
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Animals that at least at some stage in their development possess a stiff, rod-like structure running along their back, called a notochord.
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A characteristic that is passed down to an organism from its parents, being encoded in DNA.
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Discover the magical world of fungi. Neither plant nor animal, they are a separate classification of living organism. Biology - Ecosystems - Learning Points. Fungi are neither plant nor animal. Most fungi are made up of networks of...

Why is conservation important? How can we conserve biodiversity and wildlife species? Biology - Ecosystems - Learning Points. Conservation helps prevent organisms and habitats being lost. Protection is the best approach to conservation,...

Examples of physical and behavioural adaptations which allow plants and animals to survive in some of the most challenging habitats on Earth. Biology - Adaptation And Evolution - Learning Points. Animals and plants survive in diverse...

How energy is passed through living things can be described as a food chain. Journey through a food chain, from primary producers at the bottom to tertiary consumers at the top. Biology - Ecosystems - Learning Points. A 'food chain'...

Discover how climate, water, soil, plants and animals function as one and depend on each other in distinct ecosystems, which can range from a pond to an ocean, a tree to a vast forest. Biology - Ecosystems - Learning Points. An ecosystem...

DNA profiling can match individuals to a crime scene using only a few cells. A brief history of DNA profiling and the breakthroughs that have made this possible. Biology - Cells And DNA - Learning Points. DNA is described as a...