What assumption is made when constructing a cladogram?
question 25 options:
the fewer derived characteristics shared by groups, the more recently the groups share a common ancestor
the more derived characteristics shared by groups, the more recently the groups share a common ancestor
the fewer ancestral characteristics shared by groups, the more recently the groups share a common ancestor
the more ancestral characteristics shared by groups, the more recently the groups share a common ancestor

D. The more ancestral characteristics shared by groups, the more recently the groups share a common ancestor.

Explanation - Cladogram is the representation of organisms that shows their ancestory. Phylogenetic or evolutionary relationship between the organisms are calculated and drawn using lines and nodes. Nodes represents the common or same ancestor between the species under consideration.

The derived characters in organism is also taken into consideration while mapping the cladogram. Cladogram represents that the species that had more ancestral characteristics in common are likely to have a common ancestor. We can study and analyze as to how the evolution have occurred.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.  

answer; motor (efferent)neurons;