A group of individuals that matches the population on important characteristics such as age and sex is called a(n):

The child's abdomen typically swells with fluid with the disorder kwashiorkor

Indicate whether this statement is true or false.

It's a cold and snowy day, and it's tempting to skip class for the day to avoid going out in the weather. What could you do to make it easier to resist that temptation?

a. Tell yourself that if you skip class just this once, you'll be less likely to do it on other days. b. Think of all the fun outdoor activities like cross country skiing and sledding that you could do in the snow. c. Remind yourself that it'll be a lot easier to get an "A" in your class if you go to class every day. d. Think about how nice it would be to curl up with your textbook and a cup of hot chocolate at home.