A type of membrane that will only allow certain particles and ions to pass through its membrane.
Answer:Rachel Carson Book's "Silent Spring" changed the way people thought and treated the Earth by showing the destructive impacts of pesticide use on animal life. Explanation: ... Silent Spring is considered the first worldwide warning against the harmful effects of pesticide use in agriculture.
Explanation:
If you're talking about eukaryotic cells then it's the cell wall. If it's a prokaryotic cell sometimes the slime layer secreted by some bacteria may harden and form a capsule around the bacterial cell.
Hope i helped!
