<span>When the microscope was invented, it helped the cell theory. This invention allowed scientists to see that everything was made up of cells and see what cells do. They needed this invention in order to see that cells existed and study them more in depth.</span>
I do believe that it is C. crossing over :) I hope that is correct, it seems like the only plausible answer.
The closest answer is C
The sympathetic nervous system is the part of the autonomic nervous system that prepares the body to react to stresses such as threat or injury.
The parasympathetic nervous system is the part of the autonomic nervous system that controls functions of the body at rest.
Galaxy is a collection of stars, gas, and dust bound together by gravity. The smallest galaxies may contain only a few hundred thousand stars, while the largest galaxies have thousands of billions of stars.
