In which sentence is the underlined phrase an adjective clause? A. A male platypus can eject venom when another animal disturbs
it. B. When explorers first sketched the platypus, scientists thought the sketches were a hoax. C. The platypus, which is a mammal, has a bill like a duck and feet like an otter.
C. The platypus, which is a mammal, has a bill like a duck and feet like an otter.
"which is a mammal" is an adjective clause. An adjective clause is used to describe a noun and usually begins with one of these words: that, when, where, who, whom, whose, which, and why. In this sentence, the adjective clause begins with "which" and describes the platypus, which is a noun.
