Explain why when naming a plane we cannot use three collinear points?

When we are talking about a plane we usually talk about two dimensional surface.But in the real world there is no two dimensional thing.

For example consider a rectangular piece of paper,it has length and breadth but it has thickness which we consider as negligible.

Similarly faces of cube or cuboid forms a two dimensional plane.

When we say this is a plane we say that this is a flat surface.Word sheet is a plane.

Now coming to your question  why when naming a plane we cannot use three collinear points?

The reason being that to determine whether it is a plane or not we take two points on that surface. If the line joining that two points completely lies on that surface we say that it is a plane.

Now to draw a unique line we need only two points, So taking three collinear points and then showing it is a plane is worthless.

As i have written plane is a two dimensional surface and line is of single dimension.

So,Likewise on a line there are infinite number of points, on a plane there are infinite number of lines and to determine a unique line we need only two points, so taking three collinear points on a plane through which only one line passes is out of consideration we just need only two points.

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 !