Answer;
Low power lens
Explanation;
-When focusing on a slide, it is important to always start with low power objective lens (4X or 10X). The 4x objective lens has the lowest power and thus the highest field of view. As a result, it is easier to locate the specimen on the slide than when you start with a higher objective lens.
-Once you have the object in focus, then switch to the next higher power objective. One should then focus again on the image and then switch to the next highest power such as 25x, 40x, etc.
The major contribution made by Avery, MacLeod, and McCarty was 'transformation of nonvirulent cells with a DNA extract was blocked only if DNase was added'. This observation supported the idea that the transforming agent in Griffith's experiment was DNA.
The Avery–MacLeod–McCarty experiment showed that DNA was the transforming agent observed in Griffith's experiment.
Griffith's experiment (1928) suggested that bacteria were capable of transferring genetic information (DNA) by a process of horizontal gene transfer called transformation.
While the bacteria were killed by heat, Frederick Griffith observed that the DNA had was taken up by II-R strain bacteria via transformation.
Avery–MacLeod–McCarty experiment observed that protease enzymes did not destroy the transforming agent (but DNAse destroyed this transforming principle), thereby suggesting that the transforming agent in Griffith's experiment was bacterial DNA.
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1.) weathering.
2.) chemical weathering.
a chemical change is a change that changes the composition or substance of something.
For the answer to the question above, they are suffering from <span><u>"Sickle cell anemia"</u>. This is </span>a group of disorders that affects hemoglobin, the molecule in red blood cells that delivers oxygen to cells throughout the body. People with this disorder have atypical hemoglobin molecules called hemoglobin S, which can distort red blood cells into a sickle, or crescent, shape.