Human beings do not have a chambered-stomach like cows. Why do we lack the process of rumination, explain

Nidhi is correct...just adding one more point the 4 chambered stomach helps in digesting cellulose present in their food by rumination. In case of human we are omnivores and not totally dependent on green leaves etc for our food, so need of digesting cellulose is less compared to herbivores animals like cow deer etc. That is why, we don't possess chambered stomach.

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ruminants like cows and giraffes eat exclusively leaves, which are difficult to digest. The four chambered stomach provides a long digestive cycle, which they need to get enough energy. Humans and most other animals eat foods with more easily available energy, so a shorter digestive tract serves us just fine and there was no selective advantage in having a more complex digestive system.

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