Answer:
The fact that Tariq depends on cigarettes to relieve his stress, though he smokes so infrequently that he experiences no significant, noticeable physical symptoms when he is not smoking exemplifies B) psychological dependence.
Explanation:
The term <em>psychological dependence</em> is used to describe the cognitive and emotional process associated with the withdrawal from substances or drugs in which the individual suffers from a chronic, compulsive substance or drug seeking and use. This process is caused by the changes in the brain's structure and function that these drugs and substances cause.
The symptoms triggered by <em>psychological dependence</em> include dysphoria, anxiety, craving, pannic attacks, among others.
Answer:
establishment of a variety of restaurants.
Explanation:
Migration refers to the movement of a group of people from one geographical region (location) to another geographical destination in search of better living conditions, work or social amenities.
Migration selectivity can be defined as the likelihood or tendency that a subset (part) of a group of people are going to move (migrate) out of a particular geographical location or area.
Some of the factors that influence migration selectivity are income level, age, education, gender etc.
Hence, one way migration has affected the character of place in many large cities in Europe such as Manchester, Berlin, Paris, Rome, Stuttgart, Kyiv, etc. includes the establishment of a variety of restaurants. For example, the establishment of KFC, McDonalds, Mr Biggs were influenced by the migration of people across European cities and as such served as tourist attraction centers, thus, positively affecting the character of these places.
1. Samples of a microbial colony obtained from the natural environment are not pure culture. They are mixed cultures because the environment consists of an array of microorganisms and not one specific organism. A sample obtained from the natural environment such as water or soil may contain several species of microbes that need to be further isolated to obtain a pure culture.
2. Isolation streak plate technique involves the dilution of the sample several folds and then streaking a small amount using a sterile inoculation loop on an agar plate in a zig-zag manner. This is done to obtain a pure culture of bacteria from a mixed population by separating the microprocessor. When the sample is diluted into a small concentration and is streaked onto agar placed, widely spaced, discrete colonies of bacteria can be observed. These isolated colonies can be further cultured to obtain pure cultures by picking and re-streaking them on fresh agar plates.
3. A microbial colony is considered a pure culture because it consists of single species. A single species of bacteria cluster and form an isolated colony on an agar plate which can be further plated on fresh medium.
3-1 - If your agar plate shows discrete uncluttered colonies then you have obtained an isolated colony. The following picture might help you to understand.
3-2. If you subculture isolated microbes into a sterile nutrient broth without any contamination, it will still be considered pure culture because it is single isolated species in a sterile aseptic environment of the nutrient broth.
3.3. A pure culture can become a mixed culture due to contamination. This could be caused by airborne bacteria if your conditions are not aseptic. Contamination is possible if the work area is not clean and sterile or if the glassware is not sterile. The contamination can transform your pure culture into a mixed culture and is hence problematic. So, it is very important to maintain a sterile and aseptic environment, glassware, and instruments.
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People who have everything may not know the feeling of having nothing. The child who has nothing is willing to share because the child does not want someone to feel the same way that he/she did. Meaning, the poor child does not want someone to feel like they have nothing
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