1. True- because scientific theory means that <span>idea supported through research that attempts to explain existing observations or predict new ones.</span>2. False- because a cross-sectional means that its a study that is about different groups.
3. B-<span>An extraneous variable clarifies the relationship between the independent and dependent variables.</span>
Causes of Anemia during Pregnancy<span>. The cause of anemia truly comes down to how many red blood cells are being produced in the body and how healthy they are. A fall in </span>hemoglobin<span> levels during </span>pregnancy<span> is caused by a greater expansion of plasma volume compared with the increase in red cell volume.</span>
The quality or state of being healthy in body and mind, especially as the result of deliberate <span>effort. </span>