Question

During human evolution the hands become available for use​

Answer 1

Explanation:

Human hands are distinguished from apes by possessing longer thumbs relative to fingers. However, this simple ape-human dichotomy fails to provide an adequate framework for testing competing hypotheses of human evolution and for reconstructing the morphology of the last common ancestor (LCA) of humans and chimpanzees. We inspect human and ape hand-length proportions using phylogenetically informed morphometric analyses and test alternative models of evolution along the anthropoid tree of life, including fossils like the plesiomorphic ape Proconsul heseloni and the hominins

Answer 2

Answer:

Here's your answer...

Explanation:

1. during human evolution the climate of Earth started becoming dry. this resulted in loss of forest cover.
2. The apes which were arboreal on the trees thus descended and started walking on land.
3. The lumbar bones underwent change and the apes started walking upright on the grasslands.
4. Due to upright posture the forelimbs were freed from locomotion.
5. The legs started bearing the weight of the body and the hands became available for use.

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