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>
embryonic tissue is one similarity between the male and female reproductive systems
The right answer is B.
Miguel wants to learn doping to increase his muscle mass.
Doping involves taking stimulants to improve one's performance. Certain methods of doping are prohibited in sport unless a prescription justifies a medical reason for taking a drug. Among the banned molecules are for example:
anabolic agents, such as testosterone;
hormones and growth factors (EPO, insulin, growth hormone ...);
diuretics;
stimulants: amphetamine, cocaine ...
Depending on being a prescription or street drug.
Answer:
I believe it's True but my apologies if I may be wrong.