Three of the most prominent definitions of species are the biological species concept, the phylogenetic species concept, and the morphological species (morphospecies) concept. Drag each characteristic to the appropriate bin based on the species concept(s) to which it applies.

Biological
Not applicable for extinct species
Morphological
Relies on similarities in structure
Phylogenetic
Based on evolutionary history
Morphological and Phylogenetic
Accommodates asexual reproduction
Species acceptance criteria can be subjective
Morphological, Phylogenetic, and Biological
Used by scientists in classification

An individual can be placed or classified into a particular species depending on the concept a scientist has considered,

The three most prominent are Biological, morphological and phylogenetic species concept.

1. Biological species concept- Individuals that can interbreed naturally are placed into the same species. Therefore, Biological  species concept, not applicable for extinct species

2. Morphological - Relies on similarities in structure

This species concept places individuals having similar body structures into the same species. It can be easily applied to asexual and extinct species.

3. Phylogenetic - Based on evolutionary history

Species are classified according to a common ancestor.

4. Morphological and Phylogenetic

Accommodates asexual reproduction

Species acceptance criteria can be subjective

5. Morphological, Phylogenetic, and Biological

Used by scientists in classification

All the three concepts are used for classification.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

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