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a collection of tissues joined in a structural unit to serve a common function.
organelles that only occur in the green parts of plants. They contain the green pigment...
a kingdom of very small, single-celled organisms without a nucleus. They reproduce asexually by...
atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour,...
cells that are formed during secondary growth by the vascular cambium ring just to the outside...