Answer:
Prey
Explanation:
The aphids are the prey of the ladybug.
Lipids are unique because, they are made from one carbon skeleton unlike the other macro molecules groups which are made from smaller building blocks.
With the exception of steroid hormones, lipids are generally hydrophobic. Also lipids are relative small molecules when compare in size with other macromolecules.
You didn't put any answers, but probably environmental groups.