asteroid

"Although he was unused to the situation, he tried to act naturally."

"My sister is a biologist studying the effects of pollution on local river ecosystems. "

"The liftoff will occur in exactly twelve seconds."

"Astronomers use telescopes to study planets and stars. "

"The weather predict for tomorrow is rain. "

"While walking on the beach, we saw a bright orange starfish clinging to a rock. "

"She gave a studied reply."

"Scientists study plants to understand how they grow. "

"While walking on the beach during low tide, we saw many asteroids, also known as starfish, clinging to the rocks. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"A small group."

"The taxonomic classification of animals helps scientists understand their evolutionary relationships. "