B. Subgroups
<span>When constructing a dichotomous key, the first step is to look at the group of objects or organisms and separate them into two groups based on a single distinguishing characteristic. Then continue to separate each of the groups until each object has its own separate set of characteristics.</span>
Odd question as there is multiple types of tissue that could be tested. Is there any additional information for the question?
Most likely though, it’s epithelial tissue.
We group artworks with similar characteristics into periods or styles because it is easiest to do it that way - this way we can find common characteristics in these literary/artistic eras, and name them. For example, the Renaissance had a distinct style, which differs greatly from that of Romanticism.
B the corpus phase is the correct answer the last phase of the menstural cycle that you are missing is called <span>the follicular phase</span>
A biodiversity
Hope this helps