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Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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root

Biology; Flowers

Usually the below ground portion of a plant.

rosette

Plants; Flowers

A series of whorls of leaves or leaf-like structure produced at the base of the stem, just above the ground.

secondary growth

Plants; Flowers

Growth in a plant which does not occur at the tips of the stems or roots.

sepal

Plants; Flowers

The outermost structures of a flower.

shoot

Biology; Flowers

Usually, the above ground portion of a plant, bearing the leaves.

siphonostele

Plants; Flowers

When a plant's vascular tissue develops as a central cylinder, it is said to have a siphonostele.

spermatophyte

Plants; Flowers

A seed plant.

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