It depends on the person.
Adelie penguins are the most common species in Antarctica.
The most common name for a turtle is likely just "turtle." However, specific species may have other common names, such as red-eared slider or box turtle.
The most common species of dog as a pet is a labrador retreiver.
There are different species of chamomile with different scientific names. The most common species (the kind widly used in tea) appears to be Matricaria chamomilla.The various species and their scientific names can be found at the US Department of Agriculture's PLANTS database, searching "chamomile" under Common Name:
Species have the most in common.
Acording to a research about the most popular names of the new generation of children... the most common male names in Brazil are: ---- And the most comon names for girls in Brazil are:
Most of the names in the world start with A
what is the ten most common names in major league baseball
There are no common names...every different name is unique! :)
humans
A lot of protists have only been recently discovered or due to their small size are virtually unknown to most people. This causes many of them to lack common names. However, for those that do have common names you can usually find them by doing a google search. Also see the Wikipedia page on protists where many are shown with their common and scientific names.
I would guess rats are the most common mammal in the world.