Dissolved oxygen refers to the oxygen present in water which is necessary for many forms of aquatic life. Any change in the amount of dissolved oxygen affects the aquatic life.
Fishes, invertebrates and the aquatic plants need dissolved oxygen for respiration. Microbes like bacteria and fungi also require it for the breakdown of organic matter. A decrease in dissolved oxygen affects the growth, reproduction of fishes and mortality of fishes rises. This results in the accumulation of dead fishes called the fish kill leading to water pollution. Decrease in dissolved oxygen also affects the growth of other aquatic forms and results in the accumulation of organic material in the water body. This is because it results in increased BOD (biochemical oxygen demand) which is the amount of oxygen required by the aerobic microorganisms to breakdown the organic matter.
The correct answers are:
(1) The bacteriophage takes fragments of the cell with it during transduction
(2) The bacteriophage does not erupt from an infected cell during transduction.
<span>(3) Transduction transfers DNA from the chromosome of one cell to another.</span><span>
Transduction is the process wherein a bacteriophage (a virus) injects foreign DNA to be incorporated in the bacterial genetic material. Usually the most common differentiating feature between bacteriophage infection and transduction is that infection is usually destructive and lytic as the bacteriophage uses the bacteria for its own self-replication then it will erupt from the bacteria.</span>
A.) Gymnosperms are the first seed plants.
The main factor that cause agriculture rise suddenly would be the end of the ice age. Since the temperature drop and the climate changes, the soil start to flourish with many plants. Human slowly understand what plant could be eaten. They start to learn and try to take care of the plant and found it was easier than looking for other food source.
Answer:
Explanation:
Since the sun is out for less time when the days shorten the chlorophyll levels drop, which is why the leaves turn brown or other colors then fall.