Answer:
Boris Johnson became Prime Minister on 24 July 2019.
Explanation:
Contamination can have undesirable consequences in real experiments, some of them are related to the feelings that may arise in the research participants, the contamination bias reduces the differences between the research groups, and can cause a comparison between the treatments of each different group, the which can generate conflicts and rivalries on the part of groups that consider themselves to be inferior to others. These contamination-related problems can significantly interfere with the research results.
Explanation:
refers to better conditions for farm workers
Answer:
<u>D. Americans are less likely to identify themselves as group members today than in the past.</u>
Explanation:
Recently Americans do not difine themselves or identify themselves as a group members. In other times belonging to a certain gruop was part of a very importan aspect of americans. Americans identites can be based on another facts, maybe more individialistc aspects than actually belonging to a certain social group.
Answer: c. Producers.
Explanation:
A hydrothermal source is a crack in the earth through which water flows, was heated under the surface by magma. Heat causes water to flow precipitously to the surface. If the crack is on the earth, it is called Geyser, and if it is underwater, it is called fumarole.
Producers are those organisms that synthesize organic matter from inorganic matter, in marine ecosystems marine plants are the primary producers.
For producers to acquire energy, sunlight is necessary, so it was considered impossible for producers to exist in deep waters in the oceans. However, around the fumaroles ecosystems have been found that subsist only with minerals that come from the expelled water, such as sulfur.
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