Given a scientific passage and an answer, generate a question for the given answer.

Input: Consider Input: Passage: Opposite charges attract, and like charges repel. Answer: attract

Output: What do opposite charges do to one another?

Input: Consider Input: Passage: Hormones Hormones are molecular signals that help regulate a number of biochemical processes. Single amino acids and short protein chains are very common types of hormones. For example, insulin is a protein hormone that regulates the amount of glucose present in the bloodstream. Answer: hormones

Output: What do you call the type of molecular signals that include insulin and that help regulate a number of biochemical processes?

Input: Consider Input: Passage: The differences in the biomes are due to differences in the abiotic factors , especially climate. Climate is the typical weather in an area over a long period of time. The climate includes the amount of rainfall and the average temperature in the region. Obviously, the climate in the desert is much different than the climate in the rainforest. As a result, different types of plants and animals live in each biome. Answer: abiotic
Output: The differences in the biomes is due to differences in the what factors?