When the temperature reaches 0˚C (32˚F), the top layer of the lake freezes and turns into ice. In solid form, water molecules are less dense and thus ice floats on the top of the lake.
This solid barrier prevents any wind-induced mixing as well as protects the relatively warm water underneath. Furthermore, light is also blocked so that photosynthesis is inhibited during this period. As the lake water is separated from the atmosphere, no direct oxygen diffusion occurs.
All these factors together causes a more even distribution of nutrients and gases in a lake in winter.
Answer: Option D) All living things are made up of cells
Explanation:
The cell theory states that:
- the cell is the structural and functional unit of life
- all living organisms are made of cells
- all cells come from previously existing cells
- there is no life apart from the life of cells
- all living things are either single cells (unicellular) or group of cells (multicellular)
Answer:
They all have eukaryotic cells
Explanation:
Hope this helps!
<span>Good Morning!
The use of skin graft is necessary for a number of reasons. Some treatments use this procedure temporarily, just to prevent infection or the like, while other treatments use it permanently to replace a completely lost area of the skin.
One of the functions, in both cases, is to protect the area from possible infections.
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