Question

A. Fill in the blanks with the correct words.
1. An excessive growth of
(plants/algae) causes eutrophication.
2
(Sewer/Onsite disposal) system is a channel system of pipelines
used to carry sewage.
3. Air is blown into the sewage in
(sedimentation/aeration) tanks.
4
(LPG/Biogas) is produced by the action of bacteria on the organic
matter of the sludge.
5.
(Earthworms/Ants) are used to convert human excreta into compost
in vermi-composting toilets.
​

Answer 1

Answer:

1(algae),2(sewer) ,3,(aerations) ,4(biogas),5(earthworms)