Scientists Have Found That the Lifetimes of MRNAs Coding for Pair-Rule

Scientists have found that the lifetimes of mRNAs coding for pair-rule regulatory elements in Drosophila embryos may last only a few minutes. What does this suggest about the overall developmental plan of an animal body?

A) The role of mRNAs is less important than the position of genes in chromosomes.
B) Homeotic genes have greater impact in forming an embryo than mRNA from pair-rule genes.
C) Building an animal body requires a sequence of precisely timed steps.
D) Timing of pair-rule sequence determination is not as important as spatial signaling.

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