Why is classification always changing?

It is because some things don't fit in the set systems such as animalia, plantae, protista, and so on.

Scientists have to alter the system so as to fit those strange beings into a kingdom, phylum, class, order, family, genus, and species to come up with a scientific name.

1. when the tempature rises,your sweat glands and then springs into action making perspiration. some sweat evaporates with your skin taling heat with it.2.some of the blood pumped by the heart travels by your lungs to get rid of carbon dioxide and pick up oxygen.3.saliva produces by, you drinking water which saliva is 98% of. when mucus builds up in your body it also creates saliva as well as, antibacterial compunds.4.when the core body tempature drops, the shivering reflex is triggered to maintain homeostasis. for example: when you get out the pool you start to shiver because it is cold.

C) reflection (i also looked up the other choices just to make sure)