If a student wants to study the effect of sunlight on plant growth. In his experiment, 12 plants receive normal amounts of sunlight, but half of them are kept under bright sun lamps all night long. The control group is: the amount of light the plant receives.
<h3>What is control group?</h3>
A control group is a type of experiment carried out using two variables based on this control group can be defined as the process in which experiment is carried on two different variables such as dependent variables and independent variables in which one of the variables is not experimented or tested.
Based on the given scenario if after 6 weeks, the plants heights measured which inturn means that the control group is the amount of light the plant receives.
Therefore if 12 plants receive normal amounts of sunlight, but half of them are kept under bright sun lamps all night long. The control group is: the amount of light the plant receives.
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Rahm Emanuel, the current mayor, is going to be up for reelection this February 24th.
Answer:
1. to give the legislature the power to pass new laws
2. to discourage racial mixing
3. to retain public support
Explanation:
The Pearsall Plan, which was a response of the North Carolina to the ruling of the United States Supreme Court on the unconstitutionality of racial segregation in public schools.
Created in 1956, Pearsall Plan sought a moderate approach to mix their public schools, however, in the bid to achieve their goal, the plan gave reason the state (North Carolina) should amend her Constitution, to reach common ground on the issue. The following are the reasons given:
1. to give the legislature the power to pass new laws: this enable the legislature to passed legislation that delay the integration.
2. to discourage racial mixing: there is also amendment of Compulsory School Attendance Law which excused students from going to integrated schools, there by discouraging racial mixing in public schools.
3. to retain public support of school: the plan seek to give more power to the school board which in turn, helps to retain public school supports.
Thereafter, in the case of Godwin v. Johnston County Board of Education (1969), ruled the Pearsall Plan unconstitutional.
The correct answer is B) No historians have written about the era that preceded the ancient era.
The option that could be a reason why humans know very little about the time before the ancient era is that no historians have written about the era that preceded the ancient era.
We are referring to what is cold prehistory, the time where events occurred before the existence of written records. Historians write what they can research or interpret written records from the past such as the clay tablets of Sumer-Mesopotamia or the Egyptians glyphs due to the Rosetta Stone. But without written records, all is speculation, that is why humans know so little about prehistory.
