Answer:
The short answer is, yes and no. There's only a handful of animals like mammals or birds that have a parasitic relationship; one such is the Vampire Bat, yes, although one could argue it could also be considered a form of hunting too.
Explanation:
Muscle cells are produced by the brain, but blood cells are produced by the heart.
Is it the food cycle you are referencing? This is when an organism lives off the energy it's surroundings (food) provide. Or in the case of producers makes its own energy.
Answer:
<em>Some benefits of genetic engineering in agriculture are increased crop yields, reduced costs for food or drug production, reduced need for pesticides, enhanced nutrient composition and food quality, resistance to pests and disease, greater food security, and medical benefits to the world's growing population</em>.
