5000
When an animal species' numbers drop to levels that the population has problems sustaining itself, then it becomes eligible for listing.
If the population growth rate becomes zero the population size becomes static. It stays where it was when it became zero until the rate changes. If the rate becomes negative the population would begin to shrink.
When people migrate the population that they left becomes smaller. When these people migrate to where they are going to that population becomes larger.
If a population of animals becomes so tiny it has trouble sustaining its numbers, then it becomes endangered.
A migrant becomes an Australian when he/she is approved of or given Australian Citizenship. For this, you fist need to check if you are eligible and then apply for the citizenship.
population density
No, a J-1 visa is a non immigrant visa and therefore not eligible for transition into resident status.
Sympatric Speciation
lemmings population will grow
you will never see them again
No. Your benefits are calculated individually and do not change when your spouse begins receiving his or her benefits.
Sympatric Speciation