Answer:
There are different methods of enumeration of bacteria like viable plate count, direct microscopic method, turbidity method, etc. These methods are used to find out the number and concentration of microorganisms in any sample.
In real like the application of using enumeration methods can be seen in diary microbiology, food, microbiology, water microbiology, etc. In these sectors, the enumeration method is used to find out the quality of the food items, water.
Water quality is checked by enumerating the number of coliform bacteria by serial dilution method. In food, bacteria that cause foodborne illnesses are enumerated by using the enumeration method.
Answer: Option (A) is the correct answer.
Explanation:
It is given that the unknown substance is solid at 15 degree celsius. When further heated then heat energy breaks the bond between molecules of the solid.
As a result, temperature remains constant until all the bonds are broken down to convert the solid into liquid.
Hence, the constant 17 degree celsius temperature shows that the solid is melting and after it completely melts then it converts into liquid at 23 degree celsius.
Thus, we can conclude that the statement its melting point is 17 °C, is correct about the unknown substance.
The answer would be survival of the fittest.
This metaphor, "<em>survival of the fittest</em>," was used by Herbert Spencer to explain <em>natural selection. </em>It is sometimes also referred to as the survival for existence. This phrase came from the Dawinian theory of evolution where he explains that all species are capable of producing many offsprings. However, the survival of those offsprings depends on their ability to adapt to the risks and opportunities of the external environment.
<em>
</em>This relates to your scenario in the sense that fish lay a lot of eggs in the beginning but not all of them would live to achieve maturity. This is because even as eggs, they have many predators and are exposed to other elements. The threat pushes on even if they are able to hatch and grow up.
<em>
</em>
Answer: In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Its d the cell wall. The plant cell contains a cell wall that is absent in a animal cell.
