The surface of the lake freezes in the water, and then thaws in the spring, without a change in the size or shape of the lake. is this process constructive, destructive, both, or neither?

The process of when a lake freezes in the winter and thaws in the spring without changing the size or shape is neither constructive or destructive! It's neither.

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In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.