Define and discuss the limitations of the four species concepts.

biological, morphological, ecological and phylogenetic species concepts

Explanation:

Biological :The biological species concept defines species as groups of actually or potentially interbreeding natural populations, which are reproductively isolated from other such groups. It was the first to define species as independent evolutionary lineages. Reproductive isolation is emphasized in the biological concept.

Morphological : The morphological species concept is based on the platonic ideal of essentialism. Members of the same species should closely resemble the same ideal or type. Species are defined based on careful morphological measurements. It is the simplest and most widely used concept.

Ecological: The ecological species concept views a species in terms of its ecological niche; how the nonliving and living parts of the environment interact. It emphasizes unique roles in specific environments.

Phylogenetic :  The phylogenetic species concept deems a species as the smallest exclusive monophyletic group of common ancestry; usually defines more species than other concepts. Focused on the history of each group or pattern rather than the processes.

the answer is d p: cell, q: organ, r: organ system, s: tissue