How do gram-positive and gram-negative bacteria structurally adapt to environmental pressures?

Gram-positive bacteria have a thick peptidoglycan layer, while gram-negative bacteria have a thin peptidoglycan layer and a complex outer membrane.

Both types have identical structural adaptations.

Gram-negative bacteria have a thick peptidoglycan layer and lack an outer membrane.

Gram-positive bacteria have a thin peptidoglycan layer and an outer membrane for protection.