Halley's Comet is the most well-known comet. It's a "periodic" comet that comes close to Earth once in 75 years, allowing a person to see it twice in his or her lifetime. It was last seen on Earth in 1986, and it is expected to appear in the year 2061.
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Thr answer should be C hope this helps let me know if itś wrong
The right answer is a. Eras
A geological era corresponds to the second largest unit of time on the geological time scale behind the eon.
* The history of the Earth is divided into ten eras:
Eoarchéen: -4.0 to -3.6 billion years;
Paleoarchean: from -3.6 to -3.2 billion years;
Mesoarchean: from -3.2 to -2.8 billion years;
Neoarcheen: -2.8 to -2.5 billion years;
Paleoproterozoic: -2.5 to -1.6 billion years;
Mesoproterozoic: -1.6 to -1 billion years;
Neoproterozoic: from -1 to -0.541 billion years;
Paleozoic: from -541 to -252 million years ago;
Mesozoic: from -252 to -66 million years;
Cenozoic: from -66 million years to the present day.
The most likely result of such a condition would be the reduction in the number of animals, plants and fishes that could have survived in the water. The water would also become more acidic in nature and all living things will start dying. The water would also become unusable for the humans. This water will increase the pollution level in surrounding areas and deplete the quality of the soil.