In species with internal fertilization, the female is usually the one to take care of the young.
This kind of egg became possible only with internal fertilization.
They reproduced through internal fertilization rather than mating in water.
Human reproduction takes place as internal fertilization by sexual intercourse.
Fertilization which takes place inside the female body is called internal fertilization.
Most species of land animals reproduce by internal fertilization.
Adults mate during the months of August and September using internal fertilization.
In many species of fish, fins have been modified to allow internal fertilization.
While they may have used internal fertilization, this has yet to be demonstrated.
Wörterbuch für Biologie