Q: A snail's shell provides the snail with
A: protection.
Q: Of the examples listed, which event is thought by scientists to have led to the greatest extinction?
A: whalers of the 17th, 18th, and 19th centuries
Q: When Javier exercises, his muscle cells need more oxygen. Which would help Javier's muscle cells receive more oxygen?
A: increasing the rate his heart beats
Q: The hormone insulin is secreted by the pancreas. Which activity is most likely to trigger an increase in the levels of insulin circulating in the blood?
A:
eating