Which of the following images shows a transition from the biosphere to the geosphere?

What is the problem in this article? what solution does the article propose?

During convection, less dense fluid rises and denser fluid sinks.

Explain the physiological changes that occur when the hypothalamus stimulates the sympathetic nervous system. you can make a flowchart or a simple step process. be sure to include all chemicals/hormones secreted, glands involved and the functions of each chemical/hormone.