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primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought to be closely related to the ancestor of the first amphibians.
the inner most layer of the cortex of roots and some stems of plants.
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...
a crop consisting of one plant species which is cultivated over a large area.
microscopes that do not rely on light to produce images. They are used to study the internal...