Is it possible for a change in a single nucleotide of DNA to have an observable effect on phenotype? Give an example

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs