Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: What preventive measure can protect even young children against diseases such as viral meningitis? Answer: vaccination
Children as young as 2 years of age can be vaccinated against viral meningitis.

Question: What is the touch response in plants called? Answer: thigmotropism
The surface temperature of most stars is due to their size. Bigger stars produce more energy, so their surfaces are hotter. But some very small stars are very hot. Some very big stars are cool.

Question: What is the touch response in plants called? Answer: thigmotropism
The surface temperature of most stars is due to their size. Bigger stars produce more energy, so their surfaces are hotter. But some very small stars are very hot. Some very big stars are cool.