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wariber [46]
3 years ago
6

Which characteristics describe a spiral galaxy?

Biology
1 answer:
Shtirlitz [24]3 years ago
3 0

Answer: Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.

Explanation:

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Hawthorn maggot flies that breed on native hawthorns and those that breed on introduced European apples can mate in the lab, but
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prezygotic

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According to my research on the maggot flies breeding process, I can say that based on the information provided within the question the inability to breed in the wild is an example of prezygotic reproductive isolation. Like mentioned in the question this is basically any kind of mechanism that prevents fertilization from occurring.

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natita [175]
Cartilages of larynx, trachea and bronchi. (Carina is at the point of bifurcation.) Transverse section of the trachea, just above its bifurcation, with a bird's-eye view of the interior. (Carina not labeled; the ridge that separates the left and right bronchus.) I hope I helped you and good Luke and I know it’s night but I love to help and I ate to much sugar
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Why is it necessary to have a membrane around the cytoplasm​
irakobra [83]

Answer:

In plants, the cell wall is full of small holes called plasmodesmata. If there were no cellular membrane all of the fluid in the cell (cytoplasm) would just leak out. The membrane also acts as a barrier to the outside world, controlling the influx of nutrients, hormones, chemicals and other substances the cell uses.

In animals, if there is no cell wall so the absence of a cellular membrane would make all animals a pile of goop on the ground.

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