A study was conducted to assess the relationship between blood type (O-positive and O-negative) and a particular disease Q. Since age is often related to disease outcome, the investigators decided to consider age as a potential confounder.
Determine whether each of the a priori criteria listed below is True or False in relation to the blood type disease Q scenario and explain your answer.
1. A confounder must be a risk factor for the health outcome.
2. A confounder cannot be an intervening variable between the exposure and the disease.
3. A confounder must be associated with the exposure in the source population being studied.
4. Age is a confounder in this study.

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

Environmental impacts on evolution : mastery test

The equation shows cellular respiration. during cellular respiration, glucose combines with oxygen to form carbon dioxide, water, and atp. what happens to the energy in the bonds in glucose? the energy is transferred to oxygen. the energy is transferred to carbon dioxide. the energy is transferred to water. the energy is transferred to atp.