In 2004, tests were performed on the San Carlos Reservoir in Arizona to determine levels and distributions of some toxic metals. Cores of sediment were sampled and tested, and the scientists found that there were two time periods represented in the sediment by larger levels of copper than is recommended in sediment quality guidelines. What scientific investigation might these results lead the scientists to next?A. a study of the rate of evaporation of the water in the reservoirB. a study of companies that might dump toxic metals into the oceanC. a study of what plant species are native to various regions of ArizonaD. a study on how copper affects aquatic life in the reservoir

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.

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