A new species can develop in just a few generations. It really depends on the gestation period of the parent species and general length of parenting.
For instance, in the 1970s an area in the UK was isolated by the removal of a bridge, separating the field mice of that area from those surrounding it. Within 18 months, the mice of the isolated area developed into a new species. Divergence of rodent populations can progress fairly quickly due to the very short gestations period (20 days on average) and prolific mating.
If it's a human embryo, about nine months. If you're a mouse embryo, about twenty days. Gestation time in mammals varies species to species, but it's generally safe to say the bigger the animal, the longer the gestation.
That depends on the species. For example, fruit flies reproduce in a much shorter time than it takes people and elephants.
The length of time a caterpillar takes to go through metamorphosis depends on the species. Some take as little as two weeks, others take months. Look up the species in a field guide or on Google to find out more about the life cycle of specific species.
The theory that living species were descend with changes from other species over time is referred to as evolution.
When a certain species is divided up into two or more separate populations (geographically, for example) they continue to evolve (via natural selection) and over time the two (or more) populations will be so different from each other that they will not be able to reproduce, and will fit the criteria of different species.
Evolution
cause the other person might not like you as much...unfortunately:(
An penguin is a bird that can take a very long time to develop from an egg to an adult.
Patience.
From the time your breasts begin to develop, it should take two to three years to completely develop, however some girls do develop slower or faster than that.
2 days
If it's a human embryo, about nine months. If you're a mouse embryo, about twenty days. Gestation time in mammals varies species to species, but it's generally safe to say the bigger the animal, the longer the gestation.
A Science Experiment
A Science Experiment
That depends on the species. For example, fruit flies reproduce in a much shorter time than it takes people and elephants.
the time is how much time i take to take a shower
Depends on the pokemon inside, different species take different amounts of time to hatch. To find the time for the species you are breeding look it up on Bulbapedia.