From what I remember it's called a substrate
Gene Therapy is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele. These disorders are usually hereditary, passed down through generations.
Answer:
A
Explanation:
We do not gain the mass of the food we eat. Therefore, B is wrong. Our cells do not grow in size, they only grow in number. Therefore, C is wrong. Although the puppy's body does, in a way, stretch out, A is a better option. Therefore, D is likely to be wrong.