BIO 358 Lecture Notes - Lecture 9: Scapula, Gluteus Maximus Muscle, Latissimus Dorsi Muscle
14 Mar 2017
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How & when we became human - fossils 2. How does lanchester"s square law and throwing solve the non-kin conflict of interest problem: animal social behavior is only kin selected, however, the humans practice non-kin cooperation, since they cannot steal. They cooperate in the next hunt: kinship independent social cooperation becomes an adaptive strategy. There is a fish who knows how to spit water to make insects fall off the plants: then the fish eat the fallen insect easily. The first metacarpal (thumb) changed orientation to allow a better grip to throw. Afterwards the dorsal interosseous muscle allow a stronger grip. At the tips of our fingers, we have apical tufts while the chimps do not. The apical tufts are found among the early homo (1. 8 million years ago: dmanisi is the name of the early homo. The hands was redesigned to throw starting about 2 million years ago before the homo erectus.
