The only independent variable in this experiment is the amount of nitrogen Sarah uses. All of the other variables are dependent on other factor and processes, but Sarah controls the amount of nitrogen that she uses for each plant.
I believe the correct answer from the choices listed above is the second option. The evidence that would be most useful for making this determination would be to u<span>se radiocarbon dating to determine the age of the rock underlying the ecosystem.</span>. Succession<span> is usually initiated by a significant disturbance of an existing community. Hope this answers the question.</span>
The choices can be found elsewhere and as follows:
1.are soluble and can easily pass through cell membranes
<span>2.contain long chains of amino acids and fatty acids </span>
<span>3.contain atoms of carbon, hydrogen, oxygen and nitrogen </span>
<span>4.are a direct result of dehydration synthesis
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I believe the correct answer is option 1. When most proteins, fats, and carbohydrates are digested completely, they are converted to end products that are soluble and can easily pass through cell membranes. So as to distribute the nutrients needed in different parts of the body.
Nuclear fission occurs when an atom splits into two or more smaller atoms, most often the as the result of neutron bombardment.
