Question: Some pea plants always have peas with smooth skin. Other pea plants always have peas with wrinkled skin. How can a student best predict which kind of pea will grow from a seed that is planted?

  Options: 
 A. by checking the amount of water in the soil
 B. by checking how often the pea plant receives sunlight
 C. by checking how much space the plant will have to grow
 D. by checking the type of peas growing on the parent plants
Answer: D