The most common source of infectious diseases in water supplies is
a. algal blooms
b. sewage
c. surface runoff
d. none of the above
which of the following is not a reason that nonnative species are reared outside their native ecosystems?
a. they are commercially important.
b. they are used to replace native species.
c. they are used for restocking programs.
d. none of the above

for me i have felt invisible when i was clearly struggling,or,i made a great achievement ,and,nobody took to notice me either because they just didn't see it,or,people just turned their back on me.i can see a person being invisible by choice,or,without choice like i did.the people who are invisible by choice don't try to talk to people,don't try to make friends,and,keep to themselves.i haven't been one of those people so i couldn't give you a reason.

hope this and can i get bainliest my dude : d

the answer is false, i know this answer is late but its for anyone else that needs it.