When a population pyramid indicates that a country's population has a high percentage of young people, that usually means that the population is A decreasing B. increasing C. staying constant D. getting older Please select the best answer from the choices provided OA OB ос OD​

81 is a composite number

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.

The answer is ocho because ocho is 8