01
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Read the text below and answer questions 1–13.
In biology, symbiosis refers to close and persistent interactions between organisms of different species.
Many partnerships fall along a continuum that can shift with season, life stage, or environmental conditions.
A microbe that is helpful when food is scarce may become costly when nutrients are plentiful.
Above ground, mutualism is often easiest to see in pollination, where plants exchange resources for transport services.
Choose the correct heading for each paragraph.
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共生关系是指不同物种之间长期而紧密的相互作用。
一些关系会随着季节、生命阶段或环境条件发生变化。
Choose the correct heading for Paragraph A.
i. A theory about complex cells
ii. Underground trading networks
iii. A partnership spectrum that can shift
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