Explain people traveling to antartica may be warned to watch for signs of sehydration. how could the arctic climate disrupt osmoregulations?

What type of competition exsist between two species. turtles and fish

If a cell is placed into a hypertonic environment,what will happen to it ? a)it will shrink or shrivel b)nothing c)it will burst d) it will expand or enlarge

Are the layers of rock above and below the coal older or younger?