What is the correct term for a large number of species in an ecosystem? and is said to have (?)

How do chloroplasts set plants apart from other living things

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Plz quick a natural resource that is replaceable through a cycle in nature or sustainable practice is called a? the subject is science