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2 years ago

Why do you think species become extinct?

Biology

2 answers:

Strike441 [17]2 years ago

6 0

There are lots of different reasons y

alekssr [168]2 years ago

3 0

There are many different reasons for species becoming extinct:

- They may be hunted to extinction by predators. See the Dodo for more information on this. 

- Their have to compete with 'foreign' species for food or habitat. This happens on many small islands when new predators are introduced. See rats and cats introduced to Hawaii by sailors. 

- They may require very specialised living conditions which dissapear due to a changing environment. 

- Disease or inbreeding reduces their numbers to unsustainable levels. 

- An outside event may create a catastrophic situation. See the meteor that caused the extinction of the dinosaurs. 

It matters because we are all part of the Earth's ecosystem. Imagine all plants and animals on earth linked together in a giant 'web'. Plants are eaten by insects. They are then eaten by larger animals which are in turn eaten by humans. As humans we are at the top of the food chain so may not notice too much as we can eat a lot of different foods. However other may animals depend on very specific prey. Extinction of a species is like removing a section from the 'web'. It has a knock-on effect on everything linked to it. 

Also from a different viewpoint, biodiversity (many different species) of the Earth makes the place interesting. It may not affect our ability to survive if species become extinct, but the world would become a lesser place and slightly less entertaining.

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Nitrogen and carbon are more abundant in proteins than sulfur. Why did Hershey and Chase use radioactive sulfur instead of nitro

lora16 [44]

Answer:

Hershey and Chase experiment confirms that DNA is the genetic material of the living organism, not the RNA or protein. They also got a noble prize for this discovery.

Hershey and Chase use the radioactive sulfur to label the proteins and distinguish them from the DNA because DNA do not contain sulfur. The radioactive label phosphorus was used to label the DNA as phosphorus is specific to DNA as they wants to know exactly the genetic material. They do not use the radioactive carbon and nitrogen because both carbon and nitrogen are present in DNA and RNA. This labeling may produce confused result as it label both DNA as well as protein. The result o radioactive phosphorus and sulfur determines that DNA is the genetic material of the organism.

4 0

2 years ago

Examine the following two DNA template sequences. Sequence 1: TACGCTACGATCGTA Sequence 2: TACGCTACTATCGTA If both of these seque

makvit [3.9K]

<h2>Sequence code </h2>

Explanation:

DNA template (non coding strand) is always synthesized from 3'-5' direction and the complementary strand (coding strand) will be synthesized from 5'-3' direction; mRNA synthesized will be from 5'-3' direction and will have the same sequence as coding strand(only in place of T, U will be present)

Sequence 1: 3' TACGCTACGATCGTA 5'

Coding strand 1 : 5' ATGCGATGCTAGCAT 3'

mRNA 1: 5' AUGCGAUGCUAGCAU 3'

AUG codes for methionine(Met); CGA codes for alanine(Ala); UGC codes for threonine(Thr); UAG codes for isoleucine(Iso); CAU codes for valine(Val)

so protein 1 will be:

Met-Ala-Thr-Iso-Val

Sequence 2: 3' TACGCTACTATCGTA 5'

Coding strand 2: 5' ATGCGATGATAGCAT 3'

mRNA 2; 5' AUGCGAUGAUAGCAU 3'

AUG codes for methionine(Met); CGA codes for alanine(Ala); UGA codes for threonine(Thr); UAG codes for isoleucine(Iso); CAU codes for valine(Val)

so protein 2 will be:

Met-Ala-Thr-Iso-Val

Both the protein sequence comes out to be same hence function of protein 2 will be same as that of protein 1

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2 years ago

What happened at the end of the most recent ice age?

tester [92]

(B.) Sea levels rose over 300 feet

I think

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When the kidneys detect an increase in salt they respond by

RideAnS [48]

The kidneys respond by returning less salt to the blood

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In natural selection what must be true of traits that are passed down through generationsal selection where do the alleles or tr

goblinko [34]

I'm not sure if I will answer the question you asked, as I many have interpreted it incorrectly. In natural selection, there must be variance in the gene pool, the total frequency of alleles in a population. Now, one of the organisms may have a gene that somehow helps them survive from the selective force much better compared to the others. If this does happen, over time the gene pool will narrow down to become just the genes of that organism that survived better in the first place because the rest would be taken care of by the selective force. So, the alleles and trait come from the first organisms that had the advantage over the others of its species.

3 0

2 years ago