Placebo-controlled<span> studies is one of the ways testing a medical research in which, in addition to a </span>group<span> of subjects that receives the treatment to be evaluated, a separate </span>control group<span> receives a sham "</span>placebo<span>" treatment which is specifically designed to have no real effect. So, the answer for this question is letter D. Those placebo doses are for used as a control group in an experiment.</span>
The answer is Clams
The chart shows that the lowest pH level that the clams can survive is 6.0. Therefore, the clams would most likely die if the pH level dropped below this number.
Answer:
1. Uracil
2. Ribose
Explanation:
DNA and RNA are both types of nucleic acids. Although they are made up of similar constituent molecules, they are slightly different. All nucleic acids have three major constituents viz: nitrogenous base, pentose sugar and phosphate group.
The four nitrogenous bases found in DNA are Adenine, Guanine, Cytosine and Thymine. However, three of this bases are found in the RNA molecule but one different one called URACIL, which replaces Thymine is found. Also, the pentose (five-carbon) sugar found in DNA is deoxyribose while that of RNA is RIBOSE.
The correct answer is A
Entropy increases going from one trophic level to another. Entropy is a measure for the disorderliness of a system. As the trophic level move to the other, energy is lost so more disorder happens which increases the entropy.