my teacher assigned these worksheet questions, they are ungraded, but he said something might come up on the test really similar to this so I really want to get all of them right. I am pretty confident with all of them except for two, In the layer below a mass extinction that devastated the region, the paleontologist observed that shells of species A was present in small numbers over a widespread area whereas species B was abundant and found in a few restricted areas. Which of the following predictions about the fossil record in the layer above the mass extinction is the MOST likely to be supported by further excavations?
Species A survived because of its widespread range including some areas that were not as affected by mass extinction.
Species A survived because the low number of individuals meant that there was less competition for resources.
Species B survived because it was the more abundant and more individuals survived.
Species B survived because the population was concentrated in a few areas and had a higher chance of survival.
A scientist analyzes the vision receptor molecule in invertebrates and vertebrates. The results show that the genes for opsin, the protein part of the photoreceptor, share strong homology in the regions that code for domains involved in light response. Which of the following conclusions is the MOST likely?
The receptor molecules will be structurally different but respond to the same light cues.
The receptor molecule will be similar in invertebrates and vertebrates because of convergent evolution.
The receptor molecules will be different because invertebrates and vertebrates perceive visual cues in different environments.
The receptor molecules will be similar in invertebrates and vertebrates because they appeared early in evolution.
For the first one, I reasoned that it was most likely A, however, D caught my attention and now I am seriously doubting myself on it. This is due to the fact that the wide range of an organism might lend itself to higher survival, as some regions might better be protected or missed by harm, however, it could just as likely be D, in my opinion, as more animals might lend to quicker recuperation in any instance. For the second, I am pretty confident it is A, as homology means they come from the same source but may evolve to differ, but again, D is pretty tempting as it may be simply as it was an element that appeared early on and thus is present in both. I am only an undergrad premed, so not too savvy yet, but any help would be great.