Differential gene regulation over time can allow for the activation of globin genes. So the correct option is D.
Globins are heme proteins that are small in size and can bind to oxygen in a reversible manner. The most commonly known goal of globins is the transport of oxygen and also storage of O2 for the oxidative energy metabolism
In recent research, it has been suggested that it has an alternative function which is not related to respiration.
In the taxon of arthropods, which is species-rich and also highly ecologically highly diverse, there is a copper-containing molecule called hemocyanin which is considered the main respiratory protein.
Therefore the correct option is D.
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