Answer:
Option A, Neither the researchers nor the study participants know who is receiving the drug and who is receiving the placebo.
Explanation:
In a double blind test, both the researcher and research participants are unaware of the exercise in a medical test . During the research active medication is given to some of the research participants making sure that researcher is unaware of that while observing all the participants. However, at the end of the experiment ,both the researcher and research participants get to know who has received the treatment.
Hence, option A is correct
Answer:
At sea level, air pressure is greatest because it is caused by the weight of the entire column of atmosphere at that altitude over that location. As altitude increases, the column of atmosphere gets shorter, and so less weight is pressing down at a given altitude, so atmospheric pressure is reduced.
The answer is (d.) iridescent shark catfish.
Cartilaginous fishes are vertebrates that has jaws, paired fins, scales, and a heart like whale shark, great white shark, and manta ray. This class of fishes are divided into two: Elasmobranchii and Holocephali. While iridescent shark catfish is simply a shark catfish but not a shark.
Answer:
It can be argued that the central nervous system is of equal importance to the peripheral system because the actions that signal the brain by means of nerve impulses are carried out.
That is why a central nervous system could not be executed without the innervation of the peripheral nerves to the muscles.
Explanation:
The motor cortex is part of the central nervous system and is where all kinds of signaling and many more functions are programmed. The cortex is what sends the signals to the preganglionic neurons, and this is transmitted to the postganglionic neurons where the stimulus is finally transmitted through the motor plate in the muscles.
This whole process is considered as a perfectly planned system, so it is difficult to say or decide which of the two is more important.