B. Because of the presence of hydrogen sulphide in Brass, it combines with oxygen in air and form water, evaporates. So remained sulphide is colourless in air .So Brass gets discoloured in the air.
The reproductive system has four functions: To produce egg and sperm cells. To transport and sustain these cells. To nurture the developing offspring.
Answer: The energy comes from the sun.
Explanation:
"Introduction of non-natives always cause great harm to the environment." Non-natives don't always cause damage and/or harm.
