Answer:
d. all of the above
Explanation:
In this frame of reference, carrying capacity refers to how big a specific species can get before survival becomes difficult due to a lack of resources. That being said the carrying capacity in any environment depends on having sufficient food and shelter for the current species population and the amount of predators in the area. This last one greatly affects the carrying capacity as the more predators present means the less of the targeted species will survive.
The correct answer is C.
Cell theory is a theory, not a law because the cell theory does not have enough support to become a law.
Cell theory is referred to as the history of scientific theory. All cells come from pre-existing cells, and that is the basic unit reproduction and a basic unit of all organisms. The three tenets of cell theory are,
1. cells arise from pre-existing cells.
2. The cell an organizational basic unit and structure in organisms.
3. All living organisms are composed of more or one cells. Cell theory did not become a law because the scientist who discovered it, did not give it a credit to become a law but a theory.
Since it did not have enough support to become a law.
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The correct answer is: a. the agar and air in the petri dish are providing all of the resources needed by the bacteria.
There are four phases of bacterial growth:
1. Lag phase-bacteria prepare for reproduction
2. Log phase- cell doubling
3. Stationary phase- due to a growth-limiting factor
4. Death phase.
Answer: The correct answer for the first question is- A) species vary globally .
As per the information given in the question, Marine iguanas are found only on the galapagos islands. This indicates that throughout world, different species are found and some species are restricted to a particular area due to particular environmental conditions. Therefore, it can be said that species vary locally.
The correct answer for second question is- D). evolution is the process through which species change over time.
Evolution can be described as a process of change in the characteristics of organisms over many generations. It can be driven by various mechanisms such as natural selection, genetic drift.
Answer:
A serial dilution and the following plating experiment is done in order to determine the actual amount of bacteria/microbes in a specific volume of soil sample. As a standard test, a set volume of the lower dilution is obtained and positioned on a median plate and permitted to increase for the needed amount of time. The amount of colonies is evaluated and thus the overall Colony Forming Units (CFU) is determined by unit volume of the sample plated and therefore the volume of soil sample employed.
Therefore,
The calculation is done using:
CFU/ml = Number of colonies appeared × dilution factor / volume plated
Given,
Number of colonies appeared = 97
dilution factor = 10^(-6)
volume plated = 1/10 = 0.1
This will help us calculate it as:
CFU/ml = 97 * 10^(-6) / 0.1
= 97 * 10^(-7) CFU/ml
This CFU/ml helps determine the amount of bacterial colonies per unit volume of sample plated.
Given,
The original sample as 1g or 1000 mg of soil in its total volume.
Therefore,
The number of bacteria can be calculated using:
Amount of bacteria in original sample
= 97 * 10^(-7) CFU/ml × 1/ 1000 mg
= 9.7 * 10^(-3) CFU/mg
