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storchak [24]
3 years ago
10

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
<span>Some of the first animals to develop an endoskeleton were: echinoderms.</span>
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Elza [17]

Answer:

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A gene is composed of several nucleotides each containing a nitrogenous base. A gene is primarily made functional by the sequence of nitrogenous bases in its structure. If AGATTCA is a hypothetical sequence of the nitrogenous bases on one strand of a hypothetical gene then TCTAAGT will be the sequence of nitrogenous bases on the complementary strand of that particular gene.

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