For a parasitic organism such as ascaris what would be the selective advantage of a cuticle

Gram-negative bacteria have a cell wall that is! and does not accept the stain, making itappear

How do water’s relative densities as a solid and a liquid differ from that of most other substances? water’s solid and liquid forms have different densities, while most other substances have solid and liquid forms with similar densities. water’s solid and liquid forms have similar densities, while most other substances have solid and liquid forms with different densities. water’s liquid form is less dense than its solid form, while the opposite is true of most other substances. water’s solid form is less dense than its liquid form, while the opposite is true of most other substances.

What does this experimental investigation lack