Given a scientific passage and an answer, generate a question for the given answer.
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Question: Passage: Alkenes are unsaturated hydrocarbons with at least one double bond between carbon atoms. Answer: alkenes

Answer: What are unsaturated hydrocarbons with at least one double bond between carbon atoms called?

Question: Passage: Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity, or amount of energy, in sound waves. The unit of intensity is the decibel (dB). Answer: decibel

Answer: What is the term used to measure the intensity of sound waves?

Question: Passage: 17.6 | The Adrenal Glands By the end of this section, you will be able to: Describe the location and structure of the adrenal glands Identify the hormones produced by the adrenal cortex and adrenal medulla, and summarize their target cells and effects The adrenal glands are wedges of glandular and neuroendocrine tissue adhering to the top of the kidneys by a fibrous capsule (Figure 17.17). The adrenal glands have a rich blood supply and experience one of the highest rates of blood flow in the body. They are served by several arteries branching off the aorta, including the suprarenal and renal arteries. Blood flows to each adrenal gland at the adrenal cortex and then drains into the adrenal medulla. Adrenal hormones are released into the circulation via the left and right suprarenal veins. Answer: adrenal glands

Answer:
What glands are wedges of glandular and neuroendocrine tissue adhering to the top of the kidneys by a fibrous capsule?