An appropriate group of animals to examine to observe a malpighian tubule would be

The correct answer is: insects.

Malphigilan tubule is a structure with the function in excretion and osmoregulaton of insects, myriapods, arachnids, and tardigrades. Its structure is branchied and its function is to absorb solutes, water, and wastes from the surrounding hemolymph. The released wastes are in the form of solid nitrogenous compounds and calcium oxalate.

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In the small intestines bile emulsifies fats while enzymes digest them. The intestinal cells absorb the fats. Long-chain fatty acids form a large lipoprotein structure called a chylomicron that transports fats through the lymph system.

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