The answer is Dilutions
Bacterial culture is one of the laboratory examination that could be used to determine if a specimen contain bacteria. But it will hard to count the colony if the bacteria count is too high.
That is why the specimen of the culture need to be diluted to reduce the bacteria count of the specimen, so the result will be easier to count. The unit used would be colony forming unit(CFU) per milliliter.
B cells engulfs bacteria or toxin and then digests it. Then , it represents the antigen on its surface. The b proliferates into memory cells and plasma cells(they act of the foreign substance). Eventually a helper t cell comes on it's way and triggers more cells.
The earth's tilt of 23.5 degrees to it's axis as it revolves around the sun causes seasons; summer, spring, winter and autumn. This is due to the orientation of the earth with respect to the sun that cause variations in how to sun rays 'strike' the earth. Consequently, there are variations in temperatures across the earth, over its complete revolution, causing seasons my brotha, Hope this helps!
Answer:
<em>The correct option is C) How does sunlight affect a model of a biogeochemical cycle?</em>
Explanation:
A scientific question can be described as a question based on which a hypothesis can be made and observations and experiments can be performed. The results from these experiments and observations would account for the validation of a hypothesis. Hence, a scientific question should be a question based on which a hypothesis can be made and experiments can be performed.
In the option C, the sunlight might increase or decrease various processes of the biogeochemical cycle. We can hypothesize and perform experiments to get the results. Hence, it is a scientific question.
