What is true of all 4 groups of macromolecules? a. All macromolecules are joined by ionic bonds
b. All macromolecules are made of monomers and bond together to form polymers
c. All macromolecules are both hydrophobic and hydrophilic
d. All macromolecules contain genetic information

Explanation:

a. All macromolecules are joined by ionic bonds.  Χ. mostly covalent  

c. All macromolecules are both hydrophobic and hydrophilic. Χ. not all

d. All macromolecules contain genetic information. Χ. only nucleic acid does.

The following are examples of macromolecules and the monomers they are made from:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

i think the answer is a.keratin is the pigment responsible for skin color.