In the twenty-first century, use of ________ in research became the flashpoint of activism for animal rights.

You are standing outside in the winter. There is no wind, but the temperature is 20 degrees Fahrenheit, and you are not wearing a hat. You are losing body heat by which one of the following principles?

A) Conduction B) Radiation C) Convection D) Evaporation

Gi/gu ___________________________________________________

Fill in the blank(s) with correct word