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4 years ago

What is the impact of the depletion of fishing stocks?

Biology

2 answers:

posledela4 years ago

4 0

Answer:

Decades of destructive fishing has resulted in the precipitous decline of key fish stocks such as bluefin tuna and Grand Banks cod, as well as collateral impacts to other marine life. Hundreds of thousands of marine mammals, seabirds, and sea turtles are captured each year, alongside tens of millions of sharks.

ziro4ka [17]4 years ago

3 0

It is the same as creating more pests or setting up dominant species which upset the ecological food pyramid leading to decimation of trophic levels or predators and energy cycling. Fishes feed on microscopic algae and animals the primary base of the food chain in water, if they are not checked they will choke the rivers and oceans causing toxic waters. Fish feed to contain them, in the process they grow and increase in numbers but their population is checked by bigger fishes and so on till it reaches a top predator which is usually a large animal.

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You dilute an unknown sample of bacteria to 1 x 10-6 and plate out 10 onto a Petri dish. The next day you count 64 colonies. The

Sveta_85 [38]

Answer:

Explanation:

The correct answer would be 6.4 x $10^6$ cells/ul.

For 1 x 10-6 dilution, the plating factor is $10^6$ . To find the number of bacteria in the original sample, the plating factor is multiplied by the colony count per ul.

<em>Number of viable bacteria = plating factor x colony count/ul</em>

Since 10 ul gives 64 colonies. 1 ul will give:

64/10 = 6.4 colonies.

Therefore, the viable bacteria in the original sample = 6.4 x $10^6$ cells/ul

The correct option is b.

3 0

3 years ago

Which type of cell is most likely to have the most mitochondria? muscle cells in the legs of a marathon runner nondividing cells

MatroZZZ [7]

Answer:

muscle cells in the legs of a marathon runner

Explanation:

Mitochondria are the powerhouse of cells and serve as a site for the aerobic stage of cellular respiration. Cellular respiration is complete oxidation of nutrients in the presence of oxygen to produce a large number of ATP molecules. Therefore, the cells that require more ATP molecules as an energy source would most likely have a greater number of mitochondria.

Muscle cells are responsible for body movement. Muscle cells in the legs of a runner would require a constant supply of ATP during running since muscle contraction requires ATP. To sustain the continuous muscle contraction during the marathon, the muscle cells in the legs of the runner would have most number of mitochondria.

5 0

3 years ago

Toxoplasma is a protist that must infect cats to be able to reproduce. The infection doesn’t benefit cats and only rarely harms

marin [14]

Answer:

The correct answer is : parasitism.

Explanation:

Parasitism is a symbiosis relationship in which two organism lives together but only one is benefited and other harm in any means. Toxoplasma is, in this case, parasite which is benefited while cats are host and harmed in this relationship.

Degree and chances of harm or benefit do not defines the symbiosis relationship between two organism. Cats are rarely harmed but still harmed in this relationship.

Thus, the correct answer is : parasitism.

4 0

4 years ago

An old alternative hypothesis for the evolution of infanticide was that parents killed offspring (including their own) when food

Alika [10]

Answer:

On the basis of gender preference.

Explanation:

In the modern view of adaptation, the main cause of infanticide is not the food but the gender preference. In many societies, people killed their infant when they knew that the infant is a girl. They thought that having a girl is curse or shameful thing so they kill the infant. These type of people wants male baby or prefer male child so that's why they kill the infants. In the ancient times, infants were killed that were abnormal or having any defects but today it happen due to gender preference.

6 0

3 years ago

What is the lowest starting height from which the skater can start to successfully complete the ramp? Use the data from your cho

serious [3.7K]

Answer:

The lowest starting height the skater can be so that he complete the loop is 6 meters.

Explanation:

6 0

3 years ago