Answer and explanation:
The Columbian exchange or Columbian interchange is a term named after Christopher Columbus. It refers to the colonization and subsequent trade that began with Columbus's trip in 1492. The Columbian exchange involved the Americas, Europe, and West Africa during the 15th and 16th centuries, and resulted in an extensive transfer that greatly impacted all involved. The term contemplates not only the trade of goods, but also of animals, people, cultures, and even diseases. Some of the major things exchanged were domesticated animals - horse, donkey, chicken, cattle, turkey, parrots, guinea pig, etc. -, and fruits and plants - acai, avocado, broccoli, celery, carrot, chia, pecan, oregano, etc. It's worth remembering that products were exported to and from both the New and the Old Word. A side effect of such contact between different continents and people was the transfer of diseases. Indigenous people in the Americas were decimated by the illnesses transmitted by colonizers. The exchange of cultures had a great impact on both Europe and North America. Enslaved Africans brought their knowledge concerning agrarian practices such as water control and milling. Europe began shifting towards Capitalism and was the subject of population growth due to the availability of new products and crops. Colonizers introduced European values to indigenous nations, ranging from land possession and division to monogamy. There was a noticeable disrupt in ecosystems, since the trade of animals brought in invasive species - a species that is not native and, for that reason, tends to spread and damage the environment.
I believe the answer is: double-blind experiment
In double blind experiments, the subjects that receive the treatment is remained unknown by both the researchers and the subjects until the experiment is finished. The main purpose of double-blind experiment it eliminate the bias of perception that might exist among researchers.
Answer:
groups of participants differing in age at the same point in time
Explanation:
Cross-sectional design: This is a type of observational study design. In this study, the investigator calculate the exposures and the outcome in study participants at the same time.
The research involves different groups of people who have different variables of interest but consists of other characteristics, for example, educational background, socioeconomic status, and ethnicity.
Answer:
C
Explanation:
Personality test is the process of assessing human personality through questionnaires for the purpose of gathering the person's informations or details.
Therefore structured interviews, job knowledge tests and cognitive ability test has highest validity than PERSONALITY TEST.
Answer:
C. Population Shrinkage
Explanation:
Population refers to the total number of people ocuppying a place or an area at a particular time.
Population shrinkage refers to a situation where total population of a country drops due to death or when people than are born.
It follows that the population of a country experiencing population shrinkage is mostly found in eastern Europe like Ukraine. This gives concern to the governments of the countries involved thereby enabling them to focus more on the well being of their people thus increases economic growth.
