In an experimental study of differing amounts of sleep affect concentration, the levels of concentration would be considered the:
a) operational definition
b) dependent variable
c) independent variable
d) control group

The part of the nephron provides initial filtering of the blood in the urinary system.

Why is a lunch consisting of pizza, fruit, and salad a better choice than a lunch with the same number of calories from pizza alone? a)both lunches provide the same amount of energy but the lunch of pizza, salad, and fruit provides more nutrients. b)both lunches provide the same amount of nutrients but the lunch of pizza, salad, and fruit provides more energy. c)both lunches are healthful but the lunch of pizza, salad, and fruit provides more energy for metabolism. d)both lunches are healthful but the lunch of pizza, salad, and fruit is likely to have a higher fat content.

Describe 3 ways you can make sure you understand what your boss is asking for in his/her email or memo?