Plants grow through the cracks and animals dig in the soil, further breaking apart and dislodging structures. Chemical processes, like the oxidation of iron, cause unsightly rust. Carbonic acid, a result of carbon dioxide mixing with water, dissolves limestone. Acid rain also wears down stone.
Answer:
through a process called cellular respiration
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Echinoderm is the name given to a member of the phylum Echinodermata. They have radial symmetry and this includes sea urchins, sand dollars, sea stars and sea cucumbers. It is suggested that they are related to the chordates which is the answer.
