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!
A. is your correct answer
Well they can begin as cosmic rays colliding with water molecules to create clouds. Hope this helps :)
Answer:
Recycle and dispose of trash properly. Marine debris can be harmful to coral reefs. ...
Minimize use of fertilizers. ...
Use environmentally-friendly modes of transportation. ...
Reduce stormwater runoff. ...
Save energy at home and at work. ...
Be conscious when buying aquarium fish. ..
Explanation:
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