What is the name of the system that standardizes measurements in science

What part of the ear is names after tools, such as the hammer and the anvil?

Which best describes the difference between internal and thermal energy?

Which class of lever is a baseball bat? what are the parts of a baseball bat's lever class? describe each one.enter your answer in the space provided.(this question you write your own answer.)i couldn't find the right category, so sorry if this doesn't match.