1. It is if you're a penguin. This population of penguins is made of all the individuals of the same species of penguins who live together. They seem to exist in a very crowded - or densely populated - environment, and in a random configuration
2. What we might talk about as population size is actually population density, the number of individuals per unit area (or unit volume). Population growth is based on four fundamental factors: BIRTH RATE, DEATH RATE, IMMIGRATION and EMIGRATION
