Adoctor is at work taking care of sick patients. she spends a few minutes trying to figure out why a patient is sick. she taps the patients knee to test his reflexes. while she examines him, the patient coughs.
b. describe how the doctor used her circulatory and respiratory systems in this situation.
c. describe how the doctor used her immune system in this situation.
e. describe a way that any of the two doctor's systems worked together in this situation.

Are the earth's ocean floor and continents the same age geologically? why or why not?

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Explain how scientists use geologic time to determine the age of landforms.