Proteins are chains of amino acids. There are twenty different types of naturally occuring amino acids, and all organisms must have all twnety of them in order to survive. In this project we will be discussing the amoinio acid leucine. What are two ways that yeast get their amino acids, like leucine

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Answer two atoms of oxygen;

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.