What is photosynthesis??
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How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.

Some substances but not other can cross the (blank) membrane of a cell

Which of the following terms would bb represent in an organism? a.phenotype b.genotype c.genetics