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American Chemical Society
Isolation of Phytochrome
Why do soybean plants that are planted weeks apart in the spring mature simultaneously in the fall? Four independent activities cover the history of phytochrome research, scientist collaboration, the electromagnetic spectrum, and...
Curated OER
Pronoun Reference - Exercise 1
Do your class members need extra practice with pronouns? Learners are directed to read the sample sentences, determine whether the sentences contain pronoun reference errors, and if so, correct the problems they find. A link to an...
Curated OER
Pronoun Reference exercise 1
In this pronoun usage worksheet, students read sentences to determine whether the they contain pronoun reference errors and fix any mistakes they find. Students read twenty sentences.