2. Using these fossils, fill in the following...

2. Using these fossils, fill in the following chart: boisei afarensis a. Front tooth (incisors and canines) relative size (smaller/larger) b. Back tooth (premolars and molars) relative size (smaller/larger) c. Relative Brain size (smaller/larger) d. Sagittal crest? (Absent/Present) e. Mandible (Jaw-bone) robusticity? (Robust or Gracile)? 2. Based on these above, which skull is a robust australopithecine and which is gracile? f. boisei ___________ g. afarensis ___________

Transcript

00:01 Hello students, in this question they have asked to fill in the given chart regarding the fossils.

00:07 Here two fossils are given, one is called as boisei and the other is afarensis.

00:18 This boisei have certain characteristics like large skull and they also have large grinding teeth where certain molars measure up to 2 cm in length from front to back and they also have sagittal crest.

00:50 This sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull and these boisei are characterized by a specialized skill with adaptations for heavy chewing.

01:06 Next the second fossil afarensis had a very low forehead and they have a face that projected far forward and they also had a prominent brow ridge.

01:41 The brain of afarensis was about one third the size of the average modern human brain or about the same size as a modern ape's brain.

01:53 These afarensis have a robust skull as well as a jaw and large teeth that are well adapted to chewing.

02:08 Now we will fill in the table.

02:11 First we can write the fossils boisei and afarensis here and the first characteristics they have asked is front tooth that is incisors and canines and they have asked to provide their relative size that they are either smaller or larger.

02:41 In boisei the front tooth is relatively smaller whereas in afarensis they are larger.

02:52 Next they have asked about the back tooth that is premolars and molars...

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