Last step in wastewater treatment is a process A)Chemical
B)Biological
C)Physical
D)Mechanical

ps for aneetasarah and mmschulzul . ik you copy paste from the internet for my last questions

Some plants rely on the wind to reproduce an example is it’s important for plants to use the forces of nature to reproduce because 1. 1a white tuft of dandelion seeds 2a spiked burrs surrounding seeds 3a hard shell on a walnut? 2. 1b require pollination to reproduce 2b reproduce only asexually 3b cannot move about freely?

9. wind power creates pollution. water air soil noise

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above