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seraphim [82]
3 years ago
12

Louis Pasteur was the final scientist to settle the question of Spontaneous Generation and biogenesis by

Biology
2 answers:
Genrish500 [490]3 years ago
7 0
His experiment with his swan. Expedia flask disproved spontaneous generation in that broth was left open to air yet no life grew in the broth, the neck design of the flash trapped all possible contaminates. This broth today is still sterile despite sitting in a museum for decades.
zimovet [89]3 years ago
7 0

Answer:

Louis Pasteur disproved the theory of spontaneous generation by swan neck experiment.

Explanation:

He showed that in the flask which was open to air, new living organisms arose while no life appeared in the flask which was not open to air (in the flask with swan neck). He showed that life did not come from the killed yeast in the flask with curved neck where as in the other flask which was open to air, new organisms arose from killed yeast.

The purpose was not to show that new organisms came from killed yeast but to explain that it was actually the "air" in which living organisms were present that entered the flask when it was kept open to air. Thus life comes from pre-existing living organisms.

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Answer/Explanation:

Types of reproductive isolation include: temporal, ecological, mechanical, and behavioural.

A snail with a flat disc-like shell will not be able to mate with a snail having a conical shell - this is an example of mechanical isolation, where the animals are physically unable to mate due to incompatible body shapes and sizes.

The reproductive organs of male bush babies do not match with the reproductive organs of females of other bush baby species. - this is another example of mechanical isolation, as the sexual organs will physically not allow reproduction between these species

The mating call of a cricket is not recognized by a cricket of other species - this is an example of behavioural isolation, which results from incompatible mating rituals. I.e. the animals do not respond to each others mating behaviours

The signals sent by a male firefly are not recognized by the female firefly of other species. - this is also an example of behavioural isolation.

Temporal isolation is where species cannot interact because they do not have the same mating seasons or are not active at the same type of day. ?Ecological isolation occurs when two species do not come into physical contact to one another because they access different areas of the habitat. E.g. mating zones, food sources or nesting sites.

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Explanation:

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