B because hypothesis show the clear ness of the experiments
humans cannot impact one of Earth's systems without impacting the others because Earth's systems are interconnected. They interact with each other, moving matter from one system to the other. Changes to the atmosphere brought about by human activity eventually lead to changes in the biosphere and hydrosphere.
A circle graph is always based on percentages. True or false?
True.
1.)<span>a. antibodies
2.)</span><span>b. its mechanism is well understood</span>