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Each (both large and small) colony is carefully counted (using magnifying colony counter if needed). Each colony represents a “colony-forming unit” (CFU). For accurate counts, the optimum count should be within the range of 30-300 colonies/plate. To insure a countable plate a series of dilutions should be plated.
Evolution is not a random process. The genetic variation
on which natural selection acts may occur randomly, butnatural selection itself is not random at all.
Answer:
A structure is found in stems but not roots is node (option C).
Explanation:
Nodes are the structures that allow the growth of branches, leaves and flowers from the stem structure. The nodes are usually part of the plant's module, containing meristematic tissue -in the form of buds- that allows the growth of branches and leaves.
Although nodes on the trunk can form adventitious roots, roots do not have nodes.
Learn more:
Stems nodes and internodes brainly.com/question/1373895
Answer:
The air near the earth’s surface consists of 77 percent nitrogen and about 21 percent oxygen.
Explanation:
I hope this helps
there is also a bit of Carbon Dioxide
