Select all that apply. Which valences have the greatest tendency to form ions?

+1
+2
+3
-4
+4
-2
-3
-1

Aeukaryotic cell must be from a plant if the cell a) a nucleus b) a nuclear envelope c) cytoplasm d) a cell wall

Explain why phospholipid molecules form a bilayer. (3 marks)

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point