What are echinoderms? What type of symmetry do they have?

Echinoderms evolved from animals with bilateral symmetry. Although adult echinoderms possess pentaradial, or five-sided, symmetry, echinoderm larvae are ciliated, free-swimming organisms that organize in bilateral symmetry which makes them look like embryonic chordates.

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Explanation:

Echinoderm is any variety of invertebrate marine animals belonging to the phylum Echinodermata

Echinoderms evolved from animals with bilateral symmetry

Explanation:

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it creates acid rain

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.