What civilization was the oldest known to have traveled by sea?
a) greece
b) polynesia
c) viking
d) egypt

Which statements are true of a scientific theory but not a hypothesis

Which of these is not a function of some membrane proteins ? a.allowing polar molecules to enter the cell b.recognizing other types of cells c.receiving messeges from other cells b.carrying messages to oher cells

Which symbols below represent the ions found in the glass of water ? a. oh- and h+ b. co2 and o2 c. o2 and h2 d. nh3- and h+