Well if you had 2 or more variables you might not know what is causing what.
Answer:
true
Explanation:
if this is true or fals its true
Answer:
True
Explanation:
Sewage contains many substances in it like suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Hence it is said to be a complex mixture.
Answer:
d.wind energy pullutes less than coal
Explanation:
they are not polluting the air it is making energy also
because 12 is the Instagram of me
