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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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An obligate anaerobe is an organism that would die in an oxygenated environment. What could be assumed about these organisms?
artcher [175]

That they produce only through anaerobic respiration.

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2 years ago
Infections arising from the periapical region of the mandibular first premolars perforate through the lingual cortex to theA- Pt
Reika [66]

Answer:

The correct answer is option C- "Sublingual space".

Explanation:

If an infection perforate from he mandibular first premolars through the lingual cortex, it is very likely that it continues is way into the sublingual space. The infections located at the sublingual space are often bacterial infections that comes precisely from the floor of the mouth. If an infection goes into the lingual cortex, it will often go to the tissue under the tongue at the sublingual space.

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3 years ago
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Which feature is forming?
insens350 [35]

Answer:

An island

Explanation:

for me i got it right

8 0
3 years ago
Describe the Watson and Crick model of DNA structure. How did it fit the data provided by Chargaff and the X-ray diffraction pat
icang [17]

DNA model given by Watson and Creek in the year of 1953 gave a very detailed study regarding the structure of B DNA which is valid till date and is essentially corroborating with Chargaff's data and Xray diffraction pattern.

<h3><u>Explanation:</u></h3>

The DNA is the most common nucleic acid found in the living organisms as a genetic material. As stated by Watson and Creek, this DNA contains a double helical structure with two sugar phosphate backbones and the nitrogen bases getting projected from it inwards. The backbones are formed of ribose sugar and phosphate and joined together with a phosphodiester bond. The ribose sugar is attached to phosphates at its 3' and 5' Carbon atoms. The nitrogen bases found in DNA are Adenine, Guanine, Thymine and Cytosine. The Adenine has two hydrogen bonds with thymine and guanine has 3 hydrogen bonds with cytosine.

Each full turn of a helix is 34A and each base pair is 3.4A apart. The distance between two strands of DNA is 20A.

Chargaff's rule regarding the equal amount of adenine and thymine as well as guanine and cytosine is matching with this structure. All the other rules also do match with this DNA structure.

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3 years ago
The new foreign species will do what to the biodiversity in the lake?
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2 years ago
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