Answer:
First, let's add the missing piece of information
A school psychologist wants to test the effectiveness of a new method of teaching FrenchFrench. She recruits 100100 firstfirst-grade students and randomly divides them into two groups. Group 1 is taught by means of the new method, while group 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test (graded on a scale from 1-10) is administered and the results of the two groups are compared.
The CORRECT ANSWER IS A.
A. Group 2 serves as the control group because this group corresponds to the standard method that will be compared to the other method.
Explanation:
A control group
The control group acts as a baseline treatment that is employed in contrasting it to the other form(s) of treatments.
Ex: In this case study, a school psychologist wants to test the effectiveness of a new method of teaching French, to see if the ones taught by using a new method (are placed in group 1) do better in learning French than those taught with the traditional method (are placed in group 2). The students being taught French with the traditional method (group 2) would serve as the control group (as this is the present, proven and acceptable practice of teaching French. The factor is the method of teaching French. There are two treatments: new method and traditional method.
Therefore, the option A. is THE CORRECT ANSWER
A. Group 2 serves as the control group because this group corresponds to the standard method that will be compared to the other method.
I would say photosynthetic bacteria are the most important, because if they disappeared most of the oxygen in the atmosphere wouldnt be here and complex life like humans wouldnt exist
Species that are not closely related and that do not share many anatomical similarities can still be placed together on the same phylogenetic tree by comparing their "homologous genes that are highly conserved".
<u>Explanation:</u>
A phylogenetic trees refer a representation describing evolutionary connections between species, these trees are not conclusive evidence nor theories. In a phylogenetic tree the sequence of splitting illustrates how species or other groups developed from a set of common ancestors.
A gene transmitted by a common ancestor in two species is considered to be "a homologous gene". Although it may be equivalent in series, related sequences aren't homologous necessarily. Orthologous are homologous genes, where a gene detracts after an occurrence of speciation, but preserves the gene and its crucial role.
