Why are protozoa significant? select all that apply. protozoa contaminate the water supply. protozoa do not contribute to a food chain. some protozoa clean polluted water. some protozoa are parasitic and cause diseases like malaria. protozoa have an important role in the food chain.

Some protozoa clean polluted water, Some protozoa are parasitic and cause diseases like malaria, and protozoa have an important role in the food chain. 

I just answered this on my online class, so hope all goes well with your assignment!

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 : )

Spherical shaped cell might increase the surface area and decrease the volume.