Answer:
Only options A (first one) reflects the instances with valid experiment or conclusion.
Quality of any experiment depends upon two things reliability and validity. Reliability is measure of regeneration of results every time an experiment is performed under specific conditions.
Validity is measure of accuracy of results of an experiment. It can be check by two ways: internal validity (checks the design of the experiment) and external validity (checks if the conclusion is the real explanation of the phenomenon).
Now, in marine biologist experiment, he concluded the results only after one breeding season. This makes his results unreliable as it might have happened by chance.
Similarly, in cola experiment the taste was only checked by one candidate i.e. Karl. He might have problem in his taste buds. In addition, the temperature of cola can also affects its taste which is not taken care of in the experiment. Hence, it is not the valid experiment.
Similarly. Jeanette could use more plants for her experiment and Robert just followed only one instruction. He didn't perform any experiment.
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* BRAINLIEST WOULD BE V APRECIATED :) </h2>
Answer:
The repressor protein works by binding to the gene's promoter region, preventing the production of messenger RNA (mRNA).
In the results we can see the transverse wave alone has more energy as compared to the combined wave.
Explanation:
The wavelength wave speed and wave power of the combined wave is less than that of alone transverse wave with the same setting. Longitudinal wave is a wave whose waves travel along the line of propagation. It is different from the transverse wave. The transverse wave is the wave whose waves travel in perpendicular direction with the line of propagation.
Sound wave is a very common example of transverse wave. The transfers wave requires a medium to propagate from one to another place. this is the reason we cannot hear any sound in the space as there is no medium to carry the wave from one to another place.
In a pervious rock, water may move through.
In an impervious rock, the impervious rock acts as a water barrier.
(A large block of pervious rock is an aquifer, a store of water)