The brain is the nucleus it controls everything such as the nucleus controls everything in a plant cell and animal cell
If a partnership is formed and one partner causes losses then both sides suffer.
Think of it like sharing a toy. If two kids are sharing a toy and one breaks the toy, then neither can use it. It's similar in this manner that if one partner makes a mistake then the entirety of the firm will suffer losses on both sides.
The surface layer of the water freezes solid creating a barrier that insulates the ice below so that it keeps a steady temperature usually a few degrees above freezing (32 degrees).
