In 2011 and 2012, scientists working on the banana river in florida recorded a dramatic increase in the number of manatee deaths. over the past 50 years, this area has also seen the human population increase by more than 500,000 people. it is believed that pollution from numerous sewage tanks leaked into the water, eliminating the manatees' food source, replacing it with an alga that is toxic to the manatee. this is an example of

I believe that this is an example of human actions altering ecosystems with serious consequences. 
Am sure that today, the vast majority of extinctions can be attributed to the environmental impacts generated by human activities. The major causes of extinction includes, habitat loss; where human activities  destroy or change habitat so that it no longer supports the growth and the reproduction of a species.  

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 : )

Lacking something of the ozone layer