A paramecium is a single-celled, freshwater protist that lacks a cell wall but contains a contractile vacuole. The contractile vacuole is surrounded by rings of proteins that can contract when the vacuole is filled with water, expelling the water from the paramecium. What would happen to a paramecium placed into a freshwater aquarium that has been treated with a chemical that disrupts the function of the contractile vacuole?

The first amino acid of a new polypeptide chain is

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid