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3 years ago

Some of the first animals to develop an endoskeleton were _____. mollusks arthropods annelids echinoderms

Biology

2 answers:

Andrews [41]3 years ago

5 0

Answer:

The correct answer would be echinoderms.

Endoskeleton refers to the skeletal system found inside the body of an organism.

It is mainly found in organisms belonging to Chordata, Echinodermata, Coleoidea, and Porifera.

Echinoderms were among the first animals to develop endoskeleton.

They have a mesodermal skeleton which is primarily composed of calcareous ossicles or plates

Both of the structures are composed of crystals of calcite which form a porous structure termed as stereom.

Lubov Fominskaja [6]3 years ago

4 0

Some of the first animals to develop an endoskeleton were: echinoderms.

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