Which type of leukocyte destroys tumor cells and cells infected with viruses?

Which of the following is a real example of how social influences contribute to childhood obesity?

Policy decisions made by schools consider cost effectiveness more important than nutritious lunches. Parental practices encourage unhealthy eating at home. Children trade their lunches with other children. Teachers punish children by making them skip lunch.

Francis Bacon proposed the concept of empiricism, which moved psychology past the methods of philosophy and introduced systematic observation and experimentation to the field

Indicate whether the statement is true or false.