They have no nucleus, which means there is more room for haemoglobin - a substance which combines with oxygen in order for it to be carried around the body.
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What is a tissue?
Large numbers of specialized cells working together.
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Name 3 tissues.
Muscle, blood, and nerves.
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What are organs?
Various tissues together working for a specific function.
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Name 3 organs.
Brain, stomach, or heart.
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What is an organ system?
Various organs together working for a specific function.
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