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devlian [24]
3 years ago
12

Indiana is home to fossilized crinoids. These small, sea-dwelling invertebrates are vaguely reminiscent of starfish, and some sp

ecies of crinoid are still present on Earth today, but these animals were especially common in the world's oceans about 400 million years ago. How is this information important to the theory of evolution?
Biology
2 answers:
s2008m [1.1K]3 years ago
7 0

The presence of crinoid fossils in Indiana provides evidence that populations have changed over time.

Archy [21]3 years ago
6 0

Crinoids are echinoderms which are closely related to starfish, Sea Urchins and brittle stars. Some of the Crinoids which are found till today have evolved some 420 million years ago. By studying Crinoids, a relation can be established in terms of evolutionary changes that have occurred or have been adopted by the species itself during a certain course of time. Also a relations could also be established to work out the changing climatic conditions since 420 million years ago.

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3 years ago
Which best describes the offspring of protists?
Hunter-Best [27]

Options found elsewhere:

-always genetically identical to one parent

-always genetically identical to both parents

-never genetically identical to one parent

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Answer:

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Protists are eukaryotes that cannot be classed as animals, plants, or fungi. They are quite diverse. Examples include amoeba, plasmodium, and slime mould.

Because they are so diverse, protists also have very different modes of reproduction. Some protists undergo asexual reproduction, where they simply make a copy of themselves without a mate. Others undergo sexual reproduction.

Therefore, the only option that can be correct is "-sometimes genetically different than both parents" .

If they were always genetically identical to one parent or both parents, that would mean that sexual reproduction could not be possible. If they were never genetically identical to one parent, that would mean that asexual reproduction could not be taking place.

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