The answer is c because the other are soft
Answer:
C. Use of a semi permeable membrane.
Explanation:
This techniques improves water taste and odour. It also helps to remove contaminant from water and also impurities. it is effective and safe to use and the system is fully automated and it works as a filtration technique.
Answer:d.
Explanation:hope you guys got it that’s what I got and it was right
Answer:A-wave X is transverse and wave Y is longitudinal
Explanation: