What is an ecological pyramid and what is it used for

An ecological pyramid is a pyramid that illustrates the relations between living organisms at different levels

an ecological pyramid is a graphical way of representing how each organism in the ecosystem have a relationship between one another.

each bar that constructs the pyramid gives us information about the different trophic levels which basically means who eats whom and represents the flow of energy or biomass passed from one organism to another in an specific ecosystem.

Explanation:

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles