30% of all entering high school students become dropouts. This has been true and constant since the mid-1800s and McGuffey's <I>Eclectic Primer</I>. This is not tragedy, this is evolution in action. About 1/3 the human race has abilities other than in the intellectual arts. This includes no abilities at all. Cull the herd, reroute kids according to their real world abilities, and prevent the worst discards from breeding.

Liberal America force-feeds and breeds the worst discards. It is called income redistribution, Welfare, diversity, and above all... compassion.

Google
protozoans 526,000 hits

OTOH, if it really is protozones,

http://aeterna.com/pdfdyn/Product_%20Pipeline_%20eng.pdf
http://www.aeternazentaris.com/pdfdyn/Product%20Pipeline%20210504%20qxd.pdf
http://www.gdfengineers.com/environmental/env_waterstorage_detail.asp?ProjectID=164

and hope your teacher (instructor, EDUCATOR) is a compassionate diversity.


Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf