B) sunlight
Sunlight supports life by providing food and warmth which is needed for the population of practically anything on earth to survive
Answer:
Researchers need a lot of data to monitor a species population because the environment is very diverse in types of species found at different places .
What happens to one part of it could affect the population of other animals, humans, and may also effect the ecosystem of that certain environmental region .
Phase II of clinical trial.
Explanation:
Clinical trials aim to determine the efficiency of a proposed or experimental drug on people before it is finalized and sold into the market.
This is necessary so that the effectiveness and any side effects of the drug could be assessed before hand.
The clinical trial design explains four phases :
Phase I involves trial of the experimental drug on healthy people who come for the trial with own consent. They are paid for the trials.
Phase II involves comparing the effects of drug with general treatment. In this stage hundreds of effected people receive the drug and another group of hundreds of effected people receive the placebo.
Phase III involves testing of the drug on thousands of patients.
Phase IV involves taking reviews on the effectiveness of the drug. This stage comes after the drug has been released into the market. Any kind of ban on a drug can be imposed at this stage.
Answer:
Through the process of Anthropogenic additions of N and P to the fresh water system can provide a strongest evidence for the above mentioned hypothesis.
Explanation:
As phosphorus is less mobile than nitrogen compounds, it is less likely to be found in fresh water where the organisms fail to access it. Phosphorus bounds mostly in the terrestrial ecosystem and in the aquatic matters because it has a sticky compound.
Thus it is a limited nutrient in freshwater lake like Mairead. However, this hypothesis can be different depending on other factors. Like, by adding anthropogenic N and P, this balance can be affected largely.
