semipermeable impervious resilient unyielding
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Cell membranes allow some molecules to move freely across the membrane, while other molecules are restricted. Which term best describes this capability of a cell membrane?
Possibilities:
- semipermeable
- impervious
- resilient
- unyielding

semipermeable