Please help me with this question!

How does a gymnosperm prevent itself from pollinating the same tree

What is a dendrite and what does it do?

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.