Can someone me with this multiple choice question? (biology)

67. The answer is A. Predator Prey relationships have actually been found to be the most beneficial in ecosystems with high biodiversity. Predators and prey keep each other from becoming too over or underpopulated because when prey population is lacking, predators population decreases as well due to starvation. When predator population is high, prey population decreases and then the cycle continues, more predators die from starvation.
68. The answer is H. It's actually very interesting that cellular respiration and photosynthesis are almost opposite chemical equations. Photosynthesis takes in what cellular respiration removes. They even each other out.

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )