Cooperation helps because they both defend each other. its a friendship that allows for living longer. For example, Near sharks, fish stay behind them, so that they are not killed, thats one example.
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Usually landslides occur after a heavy rain fall because the soil becomes soft and the soil will begin to fall. Landslides can also occur after an earthquake because it would loosen the soil making it also easy to fall.
Answer:
more snow :) more snow :) more snow :) more snow :)
The bell shaped curve indicates polygenic traits. A polygenic trait is controlled by multiple alleles. Hope this makes sense :)