1. How would we know if a fossil was that of a eutherian mammal? five incisors i
ID: 147908 • Letter: 1
Question
1. How would we know if a fossil was that of a eutherian mammal?
five incisors in each premaxillary quadrant of the upper jaw
lack of development of the auditory bullae
no foramina within the bones of the skull
all teeth except for the molars are replaced
2.Molecular phylogeny indicates the stem eutherians gave rise to the Afrotheria and Boreoeutheria claded, though the ____________appears to be an intermediate sister group to Boroeutheria and, slightly more distantly, the Afrotheria.
Xenosoricida
Paenungulata
Xenarthra
Artiodactyla
3.
Members of this group feature a cloaca, reduced or absent pinnae, a simplified digestive tract, and a hemichorial placenta. The skull displays no zygomatic arch (or composed of only the maxillae), a reduced pubic symphysis, the squamosal contributes to the roof of the tympanic cavity, and the inclusion of maxilla as part of the orbital series.Which of the following is this?
Scandentia
Afrosoricida
Australosoricida
Tachyglossomorpha
a.five incisors in each premaxillary quadrant of the upper jaw
b.lack of development of the auditory bullae
c.no foramina within the bones of the skull
d.all teeth except for the molars are replaced
Explanation / Answer
1.d.
all teeth except for the molars are replaced
2 .c.
Xenarthra
3.Afrosoricida
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