<span>will Arteries take oxygenated blood from the heart to the peripheral tissues while veins return deoxygenated blood back to the heart where it is pumped to the lungs to be oxygenated and sent back to the heart to be returned to the peripheral tissues needing oxygen.</span>
Answer:
<u>The disadvantages of 'bio-magnification are:</u>
<u>Impact on Human Health</u>
Biomagnification makes humans more prone to cancer, kidney problems, liver failure, birth defects, respiratory disorders, and heart diseases.
<u>Effects on Reproduction and Development of Marine Creatures</u>
The toxic chemicals accumulate in the important organs of aquatic organisms that affect their reproduction and development processes.
For eg., the shells of the eggs of the sea-birds are very thin that might get crushed by the birds themselves during incubation. The toxic chemicals, mercury and selenium destroy the reproductive organs of aquatic creatures.
<u>Destruction of Coral Reefs</u>
Cyanide that is used in leaching gold and fishing is the main cause of the destruction of coral reefs. Coral reefs are the dwelling and feeding grounds for many sea creatures. Their destruction affects the lives of many aquatic animals.
<u>Disruption of Food Chain</u>
The chemicals and toxins which are released into the water bodies disrupt the food chain. The small organisms absorb the toxins which are eaten up by larger animals. These toxins, thus, get accumulated in the higher level of organisms.
Answer:
The same
Explanation:
Half life is the time taken for the number of atoms in a radioactive sample to decrease to half of the initial number of atoms. It is also the time taken for the activity of a radioactive sample to decrease to half of its original value.
If samples A and B were obtained from the same rock, then they contain the same number of atoms having the same initial activity even though the samples were not prepared in the same way for analysis.
Hence, samples A and B have the same half life.
The question is incomplete as it does not have the option which are:
A) 100, 7
B) 100, 14
C) 200, 7
D) 200, 14
E) 400, 14
Answer:
A) 100, 7
Explanation:
The ascomycetes reproduce by the forming ascospores which are formed by the process of meiosis thus from 1 Parent cell, 4 daughter cells are reproduced. The 4 ascospores then undergo the mitosis and 4 daughter ascospores form 8 ascospores.
If the parent cell of an ascospore contains
1. Ploidy- 2n=14 chromosomes, therefore, Meiosis process will reduce the number to half and will form the n=7 in daughter cells.
2. The DNA amount- in G2 stage will be 400 ng therefore during meiosis I, two cells with 200 ng DNA and then two more cells with 100 ng will be formed after meiosis II.
Thus, A) 100, 7 is correct.
This process is known as; refraction.
<em>Hope this helped! :)</em>
