the regulation of gene expression in individual cells coordinates the development of multicellular organisms, ensuring that tissues and organs form in their characteristic places. researchers can study how multicellular organisms develop their spatial organization by examining normal and mutant forms of organisms, such as the fruit fly, drosophila.

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explanation:

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it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.