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qaws [65]
3 years ago
9

A large number species on Earth become extinct during a short time period about 65 million years ago. Based on this pattern of e

xtinction, which is the MOST likely cause
Biology
1 answer:
max2010maxim [7]3 years ago
4 0

Answer and Explanation:

During the whole biota history, there occurred extinctions due to different reasons.  

During the Cretaceous, which took place between 145-65 million years ago, there occurred a massive extinction that eliminated most of the species on the Earth. Many of the characteristic groups of this period were affected. Dinosaurs, Plesiosaurs, Ammonites, Tricodonts, Cycas, Gynkgos, Conifers, the recent angiosperms, birds, and mammals.  

The extinction was caused by the volcanic eruptions, and the unusual fall of many different asteroids, which caused important changes on the Earth´s surface. The consequent climatic change was what ended affecting all the species directly. The extinction was gradual, although it occurred in a short geological lapse of time.  

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The sun’s energy is absorbed by plants and converted into glucose during __________. Animals eat the plants and convert the gluc
Dimas [21]
Your answer is c. hope this helps (;
5 0
3 years ago
A protein biochemist attempted to determine the amino acid sequence of a decapeptide. Use the results from the trypsin, chymotry
Maksim231197 [3]

Answer:

The possible sequence of the decapeptide is Met-Val-Lys-Tyr-Thr-Trp-Ala-Arg-Pro-Phe.

Explanation:

The cyanogen bromide cleaves the carboxyl end of Met (methionine and non-peptide). Trypsin cleaves on the C-terminal of Arg and Lys, however, not on the N-terminal of Pro, which signifies that Lys is the last amino acid in T2. Hence, Met-Val-Lys----. The middle part of the sequence can be predicted from the digestion done by chymotrypsin.

The chymotrypsin cleaves on the C terminal of Phe, Trp, Tyr, however, not on the N side of Pro. CT3 exhibit Lys, Met, Tyr, Val, as Met-Val and Tyr are the initial three amino acids, therefore, Tyr must be the fourth one. Now the sequence will be Met-Val-Lys-Tyr...

CT1 possesses Ala, Arg, Phe, Pro, as chymotrypsin cleaves the C side of the Phe, thus, the last amino acid should be Phe. Also, CT1 has Ala as the first amino acid. Also, trypsin does not cleave on the N-end of Pro. Thus, the sequence of CT1 strands will be Ala-Arg-Pro-Phe.  

In CT2, chymotrypsin cleaves on the C-side of trp. Thus, the sequence of CT2 strands as Thr-Trp is found in the middle. Thus, the whole sequence of the decapeptide strand will be:  

Met-Val-Lys-Tyr-Thr-Trp-Ala-Arg-Pro-Phe.  

3 0
3 years ago
There is little variety among organisms found in pools, ponds, and lakes.
aniked [119]
That's true. There is little variety among organisms found in pools, pounds and lakes. Despite that fact that many ponds are seasonal, lasting just a couple of month (for exemple sessile pools) while lakes can exist for more than hundred years. Lakes and ponds have limited species diversity because they are often limited from each other and from other water sources like rivers, seas and oceans. 
3 0
3 years ago
Read 2 more answers
Scientists have discovered a fossil skeleton of a whale-like creature that lived in the early Eocene epoch. The skeleton shows a
soldier1979 [14.2K]
A. Ancestors of whales may once have been able to walk.
4 0
2 years ago
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In humans, the condition for normal blood clotting (H) dominates the condition for non clotting (hemophilia) (h). Both alleles a
Fudgin [204]

Answer:

The correct answer would be - 50%.

Explanation:

Hemophilia is a sex-linked recessive disorder that takes place in males more than in females as females have two X chromosomes so if one is affected other still able to make clotting factors but in males, there are only one x chromosome.

If a hemophilic man XhY marries with a carrier women XHXh then the chances of their son for normal blooding would be :

Gametes:

Male: Xh and Y

Female: XH and Xh

Then cross:

             Xh                          Y

XH      XHXh                     XHY

    (carrier daughter)      (normal son)

Xh        XhXh                    XhY

 (hemophilic daughter)  (hemophilic son)

Thus, the chances of normal son is 50% among sons

8 0
3 years ago
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