BRAINLIEST AND 100 POINTS FIRST ANSWER GETS BRAINLIEST!!! The table below shows the half-life of an element:

Half-Life DataElement Half-Life
Uranium-235 700 million years

Scientists have found that the Uranium-235 content of an unknown prehistoric sample was reduced to one-fourth. What best describes the identity of the sample?

A stone artifact that formed 700 million years ago
A mammoth that died 1,400 million years ago
A cliff that formed 1,400 million years ago
A plant that died 700 million years ago

A stone artifact that formed 700 million years ago

Explanation:

By the details it is said that Uranium-235 was 700 million years old, so it would make sense for it to be stone since it is stone like.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.