Species may be singular or plural.
The word species is the singular and the plural form; a species of fish, many species of fish.
The word "specie" means coined (precious metal) money. The word "species" (singular or plural) is a scientific classification (taxon) of living organisms.
The word is just spelled species whether singular or plural.
The word swine is both singular and plural. Just like deer, elk, moose, species, offspring, and many other words.
The word team is singular; the plural form is teams.
These is plural, this is singular
if a word refers to a single item it is singular. if it refers to lots of things it is plural."Potato" is singular "potatoes" is a plural word."mouse" is singular, "mice" is a plural word."person" is singular, "people" is a plural word.
The word 'she' is in singular form. The plural for 'she' would be 'they'.
"Have" may be singular or plural: I have; we have.
The likely word is the singular or plural noun species(classifications of living things).
The word metastasis is singular, metastases is plural.
The singular and plural forms are spelled the same.