In natural selection, current conditions in the local environment determine which phenotypes are sucessful.
<span>a. It is important that the hairs are pulled rather than cut as DNA is found in the hair follicle which is located under the scalp. This is where the hair gets it's blood supply. If there are any drugs in the person's system, traces of it will go into the hair shaft from the blood supply by the hair follicle.
b. It's necessary because hair doesn't grow constant or consistent and 25 to 50 hairs are needed for an accurate test. This decreases false positive results.
c. The hair drug test can go back to about 90 days to see if she has been clean within that time. Beyond that, interviews with family and friends would also be helpful. Phone records would also show if there has been any contact with a dealer.
d.This doesn't prove she's guilty because it just places her at the scene and could be circumstantial.</span>
Answer:
A. Gram positive bacteria
Explanation:
Gram-positive bacteria have the cell wall that consists of a single thick layer of peptidoglycan. This peptidoglycan layer is 20-80 nm thick in Gram-positive bacteria. On the other hand, the peptidoglycan layer in cell walls of Gram-negative bacteria is only 2-7 nm thick.
The thicker peptidoglycan layer of Gram-positive bacterial cells makes them more resistant to osmotic stress than the Gram-negative cells.
When the Civil War ended, the big question concerned the state of the freed slaves of the South. Recovery of the southern economy depended on getting the freedmen back into the cotton fields. During the period of Reconstruction the Radical Republicans in Congress tried to convert the freedmen into small free-holding farmers, but the former slaves were simply not ready to manage their own farms. What emerged out of necessity was southern farm tenancy, a system of near slavery without legal sanctions.
