<span>Not every member of a particular species (one kind of organism) must be able to reproduce in order for the species to survive. If you take homo sapiens for example (Humans) there are many males and females around the world who are sterile and unable to reproduce, yet you still see the human species flourishing. </span>
Brain size has increased nearly 3x in 4 million years.
It is B because cells are basic and they grow everything that you see around you
The pectines on a male scorpion is longer because they also use it to find a female to mate with.
