A population is a group of a single species living in a certain area at a certain time. A community is all combination of all of the populations in an area

The above definition of Population & Community of species is correct.

Step-by-step explanation:

Population is the group of organisms living together in same geographical area, at a point of time. Community is the group of all organisms living together in same geographical area, at a point of time.

Population is the smaller group of interbreeding individuals of same species, Community is a bigger group of different species sharing same geographical area.

Eg : Lions in a particular forest can be defined as 'population' ; & all the organisms in a particular forest can be defined as 'community'.

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base