• Dr. Smith wants to examine whether a new drug increases the maze running
performance of older rats. Just like aging humans, older rats show signs of poorer
memory for new things. Dr. Smith teaches two groups of older rats to find a
of tasty rat chow in the maze. One group of rats is given the new drug while they
are learning the maze. The second group is not given the drug. One week after
having learned the maze he retests the rats and records how long it takes them to
find the rat chow.
Independent Variable:
Dependent Variable:

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

What is the similarities and differences between bacteria and eukaryote?

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer