Which fully grown animal has the fastest average heart rate? A. Elephant
B. Human
C. Cat
D. Rabbit
E. Squirrel

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

The body is protected against harmful flu viruses by

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?