The vertebrae protects the spinal cord
The PAX-6 gene is a gene that translates to the PAX-6 protein that serves as a transcription factor needed to activate certain genes that functions in the development of the eyes. While PAX-6 gene may look like it produces different functions for different species (such as formation of the compound eye in insects vs. formation of a single lens eye in vertebrates), it does not. It does in fact only regulate the genes required for the formation of the eyes. Absence or mutation of the PAX-6 gene will cause aniridia or absence of the iris, opaque lens and cornea, and a dysfunctional retina. Also, the function of the PAX-6 protein is conserved throughout evolution of species.
Answer: option D) phylum
Explanation:
The linnaean system of classification from largest to smallest level is as follows:
Kingdom ---> phylum ---> class ---> order ---> family ---> genus ---> specie.
Since the phylum level consists of organisms with less similar characteristics compared to class, order and genus, we can safely say it has most organisms.
Thus, phylum is the answer.
Answer:
The Bacteria from the 5 kingdom system is divided in two domain in six-kingdom system, these two domains separate all prokaryotic organisms (bacteria) into two new groups: The Archaea bacteria, and Eubacteria or true bacteria.
The archaebacteria are thought to be ancient but live in very extreme habitats such as high or low pH, high temperatures and anaerobic habitat as well where as the eubacteria are more representative of what bacteria is known for. The Archaea domain have cell walls that are different from the Bacteria as their walls do not contain peptidoglycan.
