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Which could be a pathway of food through an ecosystem?
autotroph → heterotroph → heterotroph
autotroph → autotroph → heterotroph
heterotroph → autotroph → autotroph
heterotroph → autotroph → heterotroph

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

amber has allowed scientists to study dna that has been preserved over millions of years.

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the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.