What does the stem derm mean? Many teens have to go to a dermatologist to get medication for their skin. The ectoderm is the outer most membrane of skin on a jellyfish. What does the stem derm mean? What kind of disease is dermatitis? What is a hypodermic needle used for?

What does the stem zo mean? The petting zoo is a place you can go to play with animals. Zoology is the science of studying animals. What does the stem zo mean? How does the Chinese zodiac get its name? What was important during the Mesozoic time period?

What does the stem per mean? Paper towels have a perforation mark so they are easier to tear through. If you have keen perception, you can usually see right through someone. What does the stem per mean? What should coffee grounds to when they percolate? What do you do when you perceive a problem?

What does the stem pac mean? When a baby sucks on a pacifier, it is to make the baby peaceful. A pacific lake is soothing and peaceful. What does the stem pac mean? Would a pacifist want to be a soldier in a war? What does it mean to pacify someone else?