The independent variable is the water temperature because it is not dependent on the change of another variable so the answer would be D
I think its D all of the above
C. <span>"It came in his mind / to bid his henchmen a hall uprear"
A. </span><span>"How ceaselessly Grendel / harassed Hrothgar . . ."
B. </span><span>"'Who are ye, then, ye arméd men, / mailéd folk . . .'"
D. </span><span>"'To Hrothgar I / in greatness of soul would succor bring'"</span>
The correct answer is: mammals may be relatively better at solving problems than birds.
The most famous example of problem solving animals are chimpanzees. It has been shown that those apes are capable to solve problems that require abstract reasoning. These days birds are observed for causal reasoning and it is shown that rooks and crows are capable for problem-solving tasks.
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Using bamboo results in an increased use of forest trees. Bamboo is a grass, not a tree. I don't see how using more bamboo would increase your usage of trees. This option is incorrect.
Contour plowing is when your plow around the contour lines (which are basically like elevation lines) of a hill or slope. This actually reduces soil erosion and lasting effects of natural storms and disasters, so it does not result in a need for more land. This option is incorrect.
Setting irrigation systems to run longer results in a reduction of water use. Irrigation is a system of watering, so you need water for it. It would not reduce water use. This option is incorrect.
Building more wind farms results in a reduction of fossil fuel use. If you are getting your power from renewable resources like the wind or the sun, you will not need to use as many fossil fuels, and this would reduce their use. This option is correct.
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