Part II Writing        

Directions:  Write an essay on the following topic. The topic has an outline you can follow

Topic:

Biological clocks

Introduction:

Thesis statement: Even though it is not easy to explain why, scientists believe living things must have built-in biological clocks that can be reset.

Body:

1 Topic sentence: To start with, various 24-hour rhythms observed in people’s biological clocks can be adjusted.

Example: A traveler flying from New York to London can adjust his normal rhythms to London time.

Body:

2 Topic sentence: The same kind of resetting also takes place in the biological clocks of animals and plants.

Example 1: The clock of an animal or plant can be set to the laboratory-produced hours of light and dark.

Example 2: Mussels can adjust to the tides of the new beach after being moved from the old one.

Conclusion:

Biological clocks, in a way, serve as automatic internal “watches” for all living things.