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

Passage: The pulmonary circulation carries blood between the heart and lungs. The systemic circulation carries blood between the heart and body. Answer: heart and lungs
The pulmonary circulation carries blood between what two organs?

Passage: In sexually reproducing organisms, parents pass a copy of each type of chromosome to their offspring by producing gametes. When gametes are fertilized and form offspring, each has a unique combination of chromosomes and genes from both parents. The inherited gene combination determines the characteristics of the offspring. Answer: chromosome
In sexually reproducing organisms, parents pass a copy of each type of what to their offspring by producing gametes?

Passage: In a transverse wave, such as a wave in a rope, the medium vibrates at right angles to the direction that the wave travels. The high points of transverse waves are called crests, and the low points are called troughs. Answer: crests and troughs
What do you call the high and low points of transverse waves?