Standard Setting Is Not an Exact Science,but There Are Some

question 28

True/False

Standard setting is not an exact science,but there are some hard and fast criterion for proving one standard right and the other one wrong.

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Definitions:

Notochord

A flexible rod-like structure in the early stages of embryos in all chordates, providing skeletal support.

Blastocoel

The fluid-filled cavity of a blastula.

Archenteron

The primitive gut formed during the early development of an embryo, which later differentiates into the digestive tract of an animal.

Ectoderm

The embryonic external layer of cells or tissue that forms early on and develops into the skin and nervous system.