Answer:
C. seeing, hearing, smelling and touching
Such an effect, in which the experimenter is unclear about the conclusions of the study because he is not sure if the improvement has been caused by the properties of the drug or by the participants' expectations about the effect of the drug is known as a placebo effect.
Placebos do not contain an active substance meant to affect health. They <span>can sometimes improve a patient's condition simply because the person has the expectation that it will be helpful.</span>
A hawk building its nest on an arm of a saguaro cactus is an example of commensalism
Answer:
delay constrained and easier path also
Explanation:
Your answer may be C
I'm am not certain but check again