Modern humans have existed for over 200,000 years, and each new generation has begun with a single cell-dividing, changing shape and function, organizing into tissues, organs, and limbs. With slight variations, the process has…
Modern humans have existed for over 200,000 years, and each new generation has begun with a single cell-dividing, changing shape and function, organizing into tissues, organs, and limbs. With slight variations, the process has…