Things of the same species have similar morphology and can INTERBREED
Very powerful microscopes were needed before cells could be observed in detail
Answer:
The crust
Explanation:
The solid, outer layer is called the crust.
Acid rain<span> is caused by a </span>chemical<span> 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 </span>chemicals<span> to form more </span>acidic<span> pollutants, known as </span>acid rain<span>.</span>