Answer:
Sewage treatment generally involves three stages, called primary, secondary and tertiary treatment. Primary treatment consists of temporarily holding the sewage in a quiescent basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface.
Explanation:
Hope that helps:)
The answer to your question is B- introduction of non-native animal species
Answer:
A hope spot is an area of an ocean that needs special protection because of its wildlife and significant underwater habitats. The two group of islands, considered extremely rich in marine biodiversity, are the first places in India to have been added in the list of 50 global 'hope spots'.
Answer:
12
Explanation:
the word dozen means 12 so therefore, 12 roses