Answer:
The dependent variable is: the temperature at which liquid boils.
Explanation:
The Dependent variable in a study or research is the variable that is measured after the modification or change in the particular research independent variable.
In this case, the independent variable is the treatment that liquid or water get which is the addition of 3 gm salt, and in the response to this treatment change in the boiling point of the liquid will be the dependent variable.
Thus, the correct answer is - the temperature at which liquid boils.
<u>Answer:</u> Mutations are the most fundamental way to add new genes to a gene pool.
<u>Explanation:</u>
Mutation refers to the process through which the normal sequence of altered. It may be either acquired or hereditary. It leads to addition of new genes to a gene pool.
The reason for not considering other statements as true are:
1. It is the hereditary mutation that are passed form parent to offspring's and acquired mutation is caused by external factors.
2. Acquired mutation are caused by external factors such as radiation.
3. Germ line mutation are important to evolution because they can be inherited.
The correct answer is: A. How does changing the amount of water affect the growth of corn?
While options B, C & D are not impossible to test, option A is the only question that can be tested using quantitative methods, such as statistical analysis. The question in option A states: "How does changing the amount of water affect the growth of corn?". This question is easily testable using scientific investigation, because controlled or measured amounts of water can be added to corn, and the consequent growth rate of corn can be easily measured and recorded. However, the questions in options B, C & D cannot be precisely measured using quantitative tools, since they aim to measure qualitative (subjective) factors, such as: ethics, happiness and disappointment.
Parathyriod glands produce a parathyriod hormone aka PTH
