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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.
While they may have used internal fertilization, this has yet to be demonstrated.
Human reproduction takes place as internal fertilization by sexual intercourse.
They reproduced through internal fertilization rather than mating in water.
In many species of fish, fins have been modified to allow internal fertilization.
Fertilization which takes place inside the female body is called internal fertilization.
Most species of land animals reproduce by internal fertilization.
Internal fertilization and similar courtship behavior are seen in modern salamanders.
It was originally believed that internal fertilization occurs in glandulocaudines.
Internal fertilization takes place after insemination of a female by a male through copulation.
Fertilization is external in most species, though a few show internal fertilization.
Adults mate during the months of August and September using internal fertilization.
The species uses internal fertilization - the fertilized eggs undergo direct development.
In contrast, internal fertilization takes place inside the female after insemination through copulation.
It is the only North American frog that reproduces by internal fertilization.
For example: All reptiles, such as the snake and turtle reproduce by internal fertilization.
Whatever the reason, the drive led to internal fertilization and direct development (completing the tadpole stage within the egg).
Some fish species use internal fertilization and then disperse the developing eggs or give birth to live offspring.
During internal fertilization, however, fertilization occurs inside the female's sexual organs.
The species usually have both male and female individuals, but very rarely reproduction may be parthenogenic, caused by internal fertilization.
Some studies report L. sicculus reproduce by internal fertilization, although this has not been entirely confirmed.