Sam brought home a tiny puppy. Her puppy grew. Four weeks later, her puppy had grown to twice its original size. Which answer below best explains why Sam's puppy got bigger? A. The number of cells in the puppy's body increased. B The puppy's body absorbed the food it ate. C The puppy's body cells grew larger as it got older. D Parts of the puppy's body stretched out more.

Growth and development is part of the basic characteristics of life. A newborn baby undergoes this process to become an adult.

The answer that best explains why Sam's puppy got bigger is that the number of cells in the puppy's body increased. (option A).

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•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: