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1. Cenozoic - humans
2. Mesozoic - dinosaurs
3. Paleozoic - fishes & reptiles
4. Precambrian - unicellular organisms
Answer:
FALSE
Explanation:
Papillary muscles are found in the bottom chambers of the heart and attaches to the tricuspid and bicuspid valve through tendons to facilitate blood flow during systole. It also prevent prolapse. These muscles contract before the contraction of ventricular muscles (or before the contraction of ventricles) by pulling chordae tendinae till the ventricles are relaxed. This helps in preparing the valves for high ventricular pressure
Hence, the given statement is false
You didn’t put in the full question with what you were given. I hope this helps show you how to answer the question. Sorry it’s messy
Unicellular organisms excrete waste by a contractile vacuole. A vacuole is membrane-enveloped organelle in a cell that is found in lots of microorganism. It expands, filling with water then contracts, removing all of its contents to the exterior of the cell.
Red cells take up 40%-50% of the total blood volume
