Question

A six-month-old greyhound is much smaller than normal. A kennel owner decides to breed this smaller dog. After six months, all of the puppies are noticeably smaller dogs. This trend continued through the next generation. How can you explain this scenario?

The original small greyhound did not get enough protein.
The original small greyhound did not get enough carbohydrates.
A change in the DNA occurred in the original small greyhound.
A change in the phospholipids took place in the original small greyhound.