A Feature of the Earliest Echinoderms Apparently Was Development of Endoskeletal

question 78

Short Answer

A feature of the earliest echinoderms apparently was development of endoskeletal plates with ______________ structure.

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Definitions:

Sensation

The process by which our sensory receptors and nervous system receive stimuli from our environment, an initial step in perception.

Cornea

The transparent front part of the eye that covers the iris, pupil, and anterior chamber, contributing to the eye's ability to focus.

Lens

in psychology, it often refers to the perspective or viewpoint through which an individual sees and interprets the world.

Aqueous Humor

A clear, watery fluid found in the eye, between the lens and the cornea, which helps to maintain intraocular pressure and provide nutrients.