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So , right off , the answer to your question is going to be pretty complex , because there is not simply one O allele . The rest of the fat molecule is straight . " It 's pretty hard to find a bunny that is n't cute , " he concludes . There is a significant amount of evidence to support the idea that essential molecules critical as building blocks of living cells will arise spontaneously under appropriate circumstances that may have been common during the early stages of Earth 's history . When a message from the world is pretty constant , our brains seem to begin to " ignore " them after time ! In other words , animals had discovered that tubes are structurally much more efficient than solid rods long before engineers did ! Tonight I 'm so blah that I listlessly look through the songbook , and ca n't even get interested in participating . For your science project I would suggest using tomato plants - they are susceptible to the infection and are pretty cheap and easy to grow .