Answer:
Louis Pasteur devised a way to flask that allowed oxygen in, but prevented dust from entering. The broth did not show signs of life until he broke off the neck of the flask allowing dust, and therefore microbes, to enter.
Explanation:
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Also, skates typically have a prominent dorsal fin while the dorsal fin is absent or greatly reduced in rays. Most rays are kite-shaped with whip-like tails possessing one or two stinging spines while skates have fleshier tails and lack spines. ... Another difference is that rays are generally much larger than skates.
To begin, you have to know what meiosis is. Meiosis is when a cell breaks into four daughter cells (like mitosis but with two extra daughter cells). Those four cells are still part of the parent cell, so they retain the genetics of the parent cell but split-up. So those cells are part of the foundations of the genetic build-up of the offspring.
It would be cryosphers and hydrosphere