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American Sign Language

question 480

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American Sign Language


Definitions:

Protostomes

A group of animals characterized by developmental patterns where the mouth develops from the primary embryonic opening.

Ecdysozoa

A clade of protostome animals that undergo ecdysis, the process of moulting their exoskeletons, including arthropods and nematodes.

Molts

The process of shedding or casting off old feathers, hair, or skin, or an outer shell, to make way for new growth.

Ectoderm

The outermost of the three primary layers in an embryo that develops into the nervous system and the skin, among other structures.

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