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"The complexity of the math problems made it difficult for many students to solve them. "

"The asteroid belt consists of a collection of dust, rubble, and minor planets."

"The student used a microscope to see the tiny cells in the plant leaf. "

"Many students learn about invertebrates, like insects and worms, in biology class because they are animals without a backbone. "

"The difficulty of the math problem made it hard for many students to solve it. "

"The car missed hitting the cyclist by a hairbreadth. "

"The project consists of three main parts. "

"Simple Example: "Humans, dogs, and fish are all examples of vertebrates because they have a backbone." "

"The seafood platter included a variety of crustaceans, like shrimp and crab legs. "

"The composition of the band's new song involved several different instruments. "

"The student answered the math questions accurately. "

"The teacher complicated the math problem by adding several extra steps. "