How is a louse on a human head an example of parasitism?

Based on the law of dominance, we would expect percent of the offspring from this cross to have large teeth.

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According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes