Explain how the appearance of photosynthetic organisms (bacteria, algae, and plants) changed the earth's atmosphere.

the fact that bacteria, algae, and plants are photosynthetic organisms means that they can carry out photosynthesis. They are using sunshine, water and carbon dioxide to produce carbohydrates and oxygen.

 The appearance of plants and algae caused the production of oxygen in the Earth's atmosphere.

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.

i think its the first one