Answer:
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The left ventricle must contract with more force in order to send blood to the body's extremities
I hope this helps! I'm happy to answer any other questions you might have :)
The best answer is A.) They can poison soil organisms, because pesticides contain chemicals that can be dangerous to plants.
If the paramecium was not able to contract its contractile vacuole, it would be in danger of bursting. The cell would not be able to hold too much water. This would happen faster if the paramecium was in water with a low salt concentration because there is more water and less salt, so the water would accumulate faster.