PLS HELP ME IM STRESSING RIGHT NOW I JUST NEED HELP ON THIS Which statement accurately describes a mountain ecosystem?
They usually host three or more ecosystems where animals can’t live.
They usually host one ecosystem with a variety of wildlife.
They usually host one ecosystem with a variety of plants.
They host three or more distinct ecosystems.

Are the earth's ocean floor and continents the same age geologically? why or why not?

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Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.