The biological species can be defined as the organism that can mate with each other in order to produce a fertile offspring.
They are differentiated from the other organism in the way that other organism cannot mate with other species and even if they do the offspring produced will not be fertile.
Two organism from the same species can only mate with each other.
<span>If Joseph McCarthy put you on the “black list,” that means he probably thought you were a "communist," since this was a time of great paranoia regarding communism in the United States--during the Cold War. </span>
