how does signal summation works. Can the signals just be added? Does there need to be a break in the signals?

~~16. while watching a special on animals, brianna discovers that hares tend to lose heat through their ears. based on this and what is known about surface-to-volume ratios, propose an explanation as to why hares that live in hot climates (such as the desert) have large, extended ears

During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water

What is the term for a water wave that is created by an underwater earthquake?