A species
Species is a group of living things that are so closely related that they can breed with one another and produce offspring that can breed as well.
One group of living things that are 20 inches are cats. Another group of living things in this category would be ferrets.
Nearly all living things produce fertile offspring, otherwise they wouldn't be here in the first place.
worms and slugs
A species.
The largest group of all living things is the ant.
Breed your piplup with a ditto. Or breed a femle piplup with another Pokemon from the same egg group as piplup.
because there are so many different living things
There's always a group fighting for their rights.
some one celled living things are predators
There's always a group fighting for their rights.
emboar can breed with ditto samurott an superior and another emboar and other pokemon that have a ground egg group