Which part of our control system is working when our skin realizes it is feeling pressure? A. Sensors
B. Communication center
C. Control center
D. Targets/Response

What is the function of the nucleus in the euglena cells you observed?

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?

What is the major difference between a virus and a viroid?