Evolutionists believe that species arose by gradual change from simpler forms. Strawberry plants, cherry trees, blackberries, raspberries, hawthorns and apples all have a family likeness because they all arose from a common ancestor, which resembled a primitive rose. Hence botanists call this plant family the ROSACEAE.
Similarly all primates (including humans and apes) have a common ancestor. Going back further, all species of mammals diverged from a common ancestor, and so on into the dim and distant past until we reach one common ancestor of all lifeforms, which originated the DNA coding which is universal for all plants, animals, fungi and bacteria on earth. Consequently, to evolutionists the biological species concept does not reflect any underlying reality. A species is purely a snapshot of an interbreeding population of organisms at a particular epoch in time, and as time progresses the characteristics of that population will gradually change in response to selective pressures