Explain Environmental Influences on Traits Practice Test

Identical twins have the same genotype. One twin had a balanced diet throughout childhood, while the other experienced long-term malnutrition. As adults, the well-nourished twin is taller. Which statement best describes what happened?

Himalayan rabbits all have the same genotype for a temperature-sensitive coat color trait. A student raises one rabbit in a warm room and another rabbit (same genotype) in a much cooler room. The warm-room rabbit grows mostly white fur, while the cool-room rabbit develops darker fur on cooler body parts (ears, nose, feet). Which statement best explains these results?