Answer:
True
Explanation:
A general approach is to stop CPR after 20 minutes if there is no ROSC or viable cardiac rhythm re-established. After multiple cycles of compression without results could cause injury to the victim, therefore you should call emergency services.
I think the correct answer would be algae. The cell walls of some algae are composed of minerals such as calcium carbonate. Algae belongs to the kingdom of protista where most are single celled and found in bodies of water. Most of the cell walls have microfibrils of cellulose and some contains other substances like silica, polysaccharides and calcium carbonate.