Answer: Store water, Control flooding, and Water crops.
Answer:
Take a village and divide the population in two, with an experimental group that will be given a different diet, and a control group which will continue with their normal diet.
Explanation:
In experiment design, when we want to test whether or not certain factor actually has a real effect on a population, one of the best methods to follow is to split the population in two groups: an experimental group, where we will apply the treatment, and a control group, where either a placebo or no treatment at all will be applied. The advantage of having both an experimental and a control group is that this way we can ascertain with much more clarity whether a change in the indepent variable (the treatment) has an observable effect on the dependent variable (the effect on the population).
In our example, a practical manner to test whether longevity in Russian Georgian villages is due to genetic or dietary factors, is to take one of the villages, and split the population in two groups: an experimental group, that will be given a higher calorie diet, and a control group, which will continue to consume their normal low-calorie diet. Then we would track the differences in age expectancy over time. If after a long enough period of time there's a difference in longevity between both groups, in other words, whether one of them leads longer or shorter lives than the other, then we can conclude that our test has proven that diet has a definitive effect on their longevity. If there's no significant difference, then we can conclude that diet has no relevance and it's all due to genetics.
Answer:
Social loafing
Explanation:
Social loafing: In psychology, the term social loafing refers to the phenomenon in which different people are liable to exert fewer efforts if they are doing a piece of work as compared to the work they will do when they are alone. In social loafing, the aim of people working in a group is a way of improving the accomplishment of various tasks by the talents and skills of the people being involved in the group.
In the question above, the given statement illustrates the principle of social loafing.
Answer:A trait evolves in anticipation of a future environmental change
Explanation:
A trait is developed to accommodate or adapt to a current environment.
Development of new traits occurs in species so that they can survive the current conditions, they develop traits that are needed to survive at that moment.
A trait may need to change or be altered in the future because the future is unknown , conditions can change and call for adjustment of some traits that have been acquired.
So traits evolves to accommodate the current environment not the future .
They do not need to be concerned because of the fact they <span>are not elected, they are appointed for life. </span>
