A population increases when the sum of total births, immigration is greater than total deaths and emigration in a particular time period. According to the given information, total births in one year were 6 and one deer immigrated. This means that a total of 6+1= 7 deer were added to the population.
On the other hand, 5 deer emigrated and 3 were killed. So, 5+3 = 8 deer were removed from the population. Since only 7 deer were added by 8 were removed from the population, the population growth is reduced and the population of the deer is not increasing in size.
So 6 were born that year, 5 emigrated, 3 died, and 1 immigrated. So +6, +5, -3, and -1. So 11 - 4. That would be 7. So there is 7 deer. You can determine from this information that there are 7 deer.
