A nutritionist is investigating the effects of eating oatmeal for breakfast. He asks all of his participants to eat about 350 calories for breakfast every day for six months. He assigns the experimental group to eat oatmeal with honey. He asks the control group to eat anything other than oatmeal and honey. He then tests their blood levels for cholesterol and other substances.

A) eating oatmeal
B) eating honey
C) eating 350 calories for breakfast
D) eating breakfast

B. eating honey

Explanation:

a confounding variable is eating honey for breakfast. This is an extraneous or extra variable in the experiment, which can adversely affect the effects of oatmeal for breakfast. Introduction of honey as an extra variable can ruin an experiment and the expected results, as apart from oatmeal, honey will also produce it's effects, which will wrongly be attributed to oatmeal.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

the correct answer is a