HSCI 100 Lecture Notes - Lecture 23: Brain Size, Depth Perception, Omnivore
7 Apr 2016
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The primitive atmosphere contained gases (h2o, co2, n2) that escaped from volcanoes; as water vapor cooled, some gases were washed into the oceans by rain. The availability of energy from volcanic eruption & lightening allowed gases to form small organic molecules, such as nucleotides & amino acids. Small organic molecules could have joined to form proteins & nucleic acids, which became incorporated into membrane-bound spheres; the spheres became the first cells, called protocells; later protocells became true cells that could reproduce. Small organic molecules join to form larger organic molecules. Large organic molecules possibly including rna or small proteins, aggregate within droplets. Adaptation a characteristic that makes an organism survive and reproduce in its environment. Darwin"s theory is based on 3 vital elements. Variation there is heritable variation for selection to act upon. Competition resources (food, mates, shelter) are finite and therefore limited and thus competition for survival and reproduction.
