Question: Choose your answer.

Which part of a plant is most responsible for using energy from the Sun to produce food for the plant?
My Answer: leaf

Question: Choose your answer.

An artificial pacemaker is a device that regulates the beat of the heart by an electrical stimulus. Some early pacemakers were powered by batteries and were worn externally with wires passing through the skin to the surface of the heart. Modern pacemakers are now much smaller and are implanted surgically. Which most likely has increased the lifespan and effectiveness of artificial pacemakers?
My Answer: the invention of lithium batteries

Question: Choose your answer.

How is the structure of an atom best described?
My Answer: a positive core surrounded by mostly empty space

Question: Choose your answer.

Which change would most likely cause deer to die or leave a woodland?
My Answer:
a forest fire