After hunting by european settlers, the bison population of 60 million was reduced to of its original size.
a) 1 : 60
b) 1 : 600
c) 1 : 6,000
d) 1 : 60,000

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Why are common names a problem for scientist?

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources