Which statement best describes some important characteristics of Ardipithecus?

• A. Ardipithecus was an early hominin that exhibited both bipedal locomotion and adaptations for climbing trees.
• B. Ardipithecus had a brain size comparable to that of modern humans.
• C. Ardipithecus was the first hominin to use complex stone tools.
• D. Ardipithecus lived exclusively in open grassland environments.

Answer: (A)

Verified step by step guidance

1. Understand the context of the question: Ardipithecus is an early hominin species, and the question is asking about its important characteristics. Focus on traits related to locomotion, brain size, tool use, and habitat.
2. Step 1: Recall that Ardipithecus is known for being an early hominin species that lived approximately 4.4 million years ago. It is significant because it provides insights into the transition from tree-dwelling primates to bipedal hominins.
3. Step 2: Analyze the locomotion traits of Ardipithecus. It exhibited both bipedal locomotion (walking upright) and adaptations for climbing trees, which suggests it was a transitional species between arboreal and terrestrial lifestyles.
4. Step 3: Consider brain size. Ardipithecus had a brain size much smaller than that of modern humans, closer to the size of other early hominins and great apes, which rules out the statement about comparable brain size to modern humans.
5. Step 4: Evaluate tool use and habitat. Ardipithecus predates the use of complex stone tools, and fossil evidence suggests it lived in wooded environments rather than exclusively in open grasslands. This eliminates the statements about tool use and grassland environments.