Given a scientific question, generate a correct answer to it.

Input: Consider Input: Inside each lymph node is a honeycomb of connective tissue with spaces filled by what?

Output: white blood cells

Input: Consider Input: Carboxylic acids have an acidic hydrogen atom, but esters do not. what do esters have in place of an acidic hydrogen atom?

Output: hydrocarbon group

Input: Consider Input: What brain structure is important in recognizing and recalling emotions?
Output: amygdala