The unique property of an echinoderm within higher invertebrates is their radial symmetry. These echinoderms include the famous starfish, sea urchin, sand dollars, sea cucumbers, and sea lilies. They are found at the ocean depth, form the intertidal zone to the abyssal zone.
Answer:
cells are the basic building blocks of all organisms , whether living or dead.
atoms are the basic building blocks of matter(non-living things) . every item , for eg, chair, book, toothbrush are made of atoms?
Sexually transmitted diseases caused by virus are the hardest to treat. It is difficult to treat viral infections because they usually hide inside the host's cells, they become so deeply integrated into the host's genome such that inhibiting them will amount to inhibiting the host cells.
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