BIOLOGY HIGH SCHOOL

What can limestone deposits tell scientists about the environment in which the evolved?

Answers

Answer 1
Answer: The environment was a tropical ocean
Answer 2
Answer: Limestone contains ancient organisms that contain information about the organism and what environment it has lived in. When compared to other similar species, one can find the changes from one organism to another

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What is DNA composed of?

Answers

DNA is composed of  sugar and a fosfate 

Pieces of DNA left at a crime scene can be multiplied by usinga. PCR.
b. gel electrophoresis.
c. an electrical current.
d. whole animal cloning.

Answers


The answer is A .

PCR stands for Polymerase Chain Reaction. It is a method to analyze a short sequence of DNA or RNA and is used to reproduce (amplify) selected sections of the nucleic acid.  Untold numbers of copies can be made of the DNA in just a few hours.

 PCR amplifies the regions of DNA that it targets and can therefore be used to analyze extremely small amounts of sample. This is often critical for forensic analysis, when only a trace amount of DNA is available as evidence.



Why do you think carbohydrates are used as a source if quick energy rather than fat?

Answers

1) carbohydrates cannot be dissolved easily unlike fats as they are insoluble in water.therefore the amount of energy given from carbohydrates lasts longer than fats2)fats can be accumulated on the coronary artery(the artery which supplies blood to the heart)there lots of intake of fats can result in heart attack3)carbohydrates are non sticky and from chain of compounds unlike fats.

Primary succession would most likely occur after? a forest fire. a lava flow. farm land is abandoned. a severe storm.

Answers

'The best answer is a lava flow. Primary succession happens in lifeless areas or regions where soil is not capable of sustaining life which may be caused by lave flows, retreating glaciers or newly formed sand dunes. It is one of the two types of biological and ecological succession.

Which of the following statements is true?A. Gene flow and natural selection always result in evolution.
B.Gene flow usually increases the genetic differences between two populations.
C.According to natural selection, organisms with poor adaptations will never reproduce.
D.Since genetic drift is random, it does not always favor the "healthier" or "better" organisms.

Answers

The correct answer is option D, that is since genetic drift is random, it does not always favor the better or healthier organisms.  

A mechanism of evolution in which the frequencies of alleles of a population change with generations because of sampling error is known as genetic drift. It takes place in all the populations of non-infinite size, however, its influences are strongest in small populations.  

Answer:

The answer is option D.

Explanation:

A component of development in which the frequencies of alleles of a populace change with ages due to examining blunder is known as hereditary float. It happens in every one of the populaces of non-limitless size, be that as it may, its persuasions are most grounded in little populaces.

What are the next two terms in the sequence? O, T, T,
F, F, S, S,E

Answers

Janashshshajsshsjusshshshdhshshdh
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