A. A symbiotic relationship is an interaction between two or more species in which one species lives in or on another species . There are three main types of symbiotic relationships: parasitism, commensalism, and mutualism. The first and the third can be key factors in the structure of a biological community; that is, all the populations of organisms living together and potentially interacting in a particular area . B . The daytime quality of light in forests varies with the density of the vegetation, the angle of the Sun, and the amount of cloud in the sky. Both animals and plants have different appearances in these various lighting conditions. A color or pattern that is relatively indistinct in one kind of light may be quite conspicuous in another. 3. Now check the underlined words in a dictionary. How can what you know about word roots, prefixes, and suffixes help you remember the meaning or these words? Reflection • As you study, pay attention to words with affixes you encounter. Whenever you come across a new word, take a moment to identify the prefix or suffix and think about how it alters the meaning. This practice will help you deduce the meanings of unfamiliar words on the TOEFL iBT test . Add these new words to your vocabulary flashcards and review them regularly to reinforce your learning . • Lastly, consider ways to improve your understanding and memory of word roots . What methods or techniques can you use to make it easier to remember new affixes and their meanings? Write down your thoughts to help guide your studies .
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