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birds without a keel on their breastbones and therefore unable to fly, for example ostriches.
a complex chemical compound that fills the spaces in the cell wall between cellulose, ...
the liquid found in the pleural cavity that acts as a lubricant.
the field of study that provides scientific names for organisms, describes them, preserves...
potentially lethal disease in humans and grazing animals such as cows and sheep. The disease is...
a connected network of vessels and glands, which carry lymph throughout the body.