Generate a sentence that answers this question: "A crane starts off weighing thirty pounds, then later weighs twenty pounds. When travelling, the crane will fly".

Answer: as the weight of an animal decreases , that animal will fly more easily

Generate a sentence that answers this question: "A penguin, while a bird, would avoid living in".

Answer: some birds live in forests

Generate a sentence that answers this question: "If a brick is liquefied, then the weight of it".

Answer:
phase changes do not change mass