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Lab 15 Exercises 2-7 Australopith & Early Homo FossilsExercise 2: Australopith VariationReview the image below (also on pg. 449), which contains images of two different Austrolopith species, mystery species A and mystery species B. After comparing the images, answer the questions:1.Which of these mystery australopiths is a later, more robustform?Mystery australopith B is a later, more robust form2.Describe two anatomical adaptations used to make this determination. (Be sure to describe how each trait varied in the fossils.) The sagittal crest is a distinguishing trait. On australopith B, a much more pronounced sagittal crest is shown. The teeth are larger on australopith B, showing its robustExercise 3: Australopith Bipedalism1.Examine the Lucy (Au. afarensis) skeleton. Describe at least two postcranial (below the head) traits that indicate Au. afarensiswas adapted for bipedalism.The traits that indicate that Au afarensis was adapted for bipedalism include