An advantage of using statistical over nonstatistical sampling methods in tests of controls is that the statistical methods 1. affords greater assurance than a nonstatistical sample of equal size. 2. emphasizes qualitative evaluation of results as opposed to quantitative evaluations. 3. eliminate the need to apply professional judgment in determining appropriate sample sizes. 4. provides an objective basis for quantitatively evaluating sample risk.

The right answer is,  

4. Provides an objective basis for quantitatively evaluating sample risk.

Step-by-step explanation:

Because statistical sampling methods take into account that all subjects that are part of a population have the same probability of being chosen. This type of sampling is more efficient since it has a high representativeness and allows to calculate the error in the samples.

c.35

step-by-step explanation:

8+13=21

21+8=29

29+6=35

the population of other specie of birds will decline or other specie of birds will find some alternate source of food to survive.

explanation:

according to the competitive exclusion principle, which is also known as gause's law, two specie living in the same niche and feeding on the same resource cannot co-exist stably.

as we have well studied the theory of natural selection which states that only those organisms survive which have better tendency to compete for food and adapt to the environmental conditions.

coming towards the question, what wi ll happen when one species outcompetes the other for the small fish , the other specie will not get enough food and will start to die or decline in population. eventually either other specie needs to find another alternative food source for itself or migrate at some other location where there is less competition otherwise it will just not exist anymore at that niche.

hope it !