instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: Elements and Compounds Any sample of matter that has the same physical and chemical properties throughout the sample is called a substance. There are two types of substances. A substance that cannot be broken down into chemically simpler components is an element. Aluminum, which is used in soda cans, is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is acompound (Figure 1.2 "The General Steps of the Scientific Method"). Water is a compound composed of the elements hydrogen and oxygen. Today, there are about 118 elements in the known universe. In contrast, scientists have identified tens of millions of different compounds to date. Answer: substance
answer:
Any sample of matter that has the same physical and chemical properties throughout the sample is called what?

question:
Passage: The most common mode of asexual reproduction is through the formation of asexual spores, which are produced by one parent only (through mitosis) and are genetically identical to that parent (Figure 24.8). Spores allow fungi to expand their distribution and colonize new environments. They may be released from the parent thallus either outside or within a special reproductive sac called a sporangium. Answer: spores
answer:
The most common mode of asexual reproduction is through the formation of asexual these?

question:
Passage: 24.1 The biological species concept emphasizes reproductive isolation. Answer: biological species concept
answer:
What evolutionary concept emphasizes reproductive isolation?