Sharks lose many teeth, but they can grow new ones., Complex sentence, Compound sentence, Simple sentence, Although sharks lose many teeth, they can grow new ones., Compound sentence, Simple sentence, Complex sentence, Giraffes have long necks, but they have only seven neck bones., Compound sentence, Complex sentence, Simple sentence, When an octopus feels threatened, it can change its color., Simple sentence, Compound sentence, Complex sentence, Cows can have best friends, and they can become stressed when they are separated., Compound sentence, Complex sentence, Simple sentence, Cows may become stressed because they miss their friends., Simple sentence, Complex sentence, Compound sentence, The Sun is very large, so it can hold about one million Earths inside it., Complex sentence, Simple sentence, Compound sentence, Although the Sun looks small, it is much larger than Earth., Simple sentence, Complex sentence, Compound sentence, Sharks lose thousands of teeth, and new teeth replace the old ones., Compound sentence, Simple sentence, Complex sentence, When scientists study sharks, they often observe their teeth., Complex sentence, Compound sentence, Simple sentence, Giraffes have seven neck bones, yet their necks are very long., Complex sentence, Simple sentence, Compound sentence, Although giraffes have long necks, they have only seven neck bones., Simple sentence, Complex sentence, Compound sentence, The students were surprised, and they asked the teacher many questions., Compound sentence, Simple sentence, Complex sentence, When the students heard the fact, they were very surprised., Compound sentence, Complex sentence, Simple sentence, Emma likes science, but she sometimes finds it difficult., Complex sentence, Simple sentence, Compound sentence, Because science is full of surprising facts, Emma enjoys learning it., Simple sentence, Complex sentence, Compound sentence, Octopuses can change color, and they can use this ability to communicate., Complex sentence, Simple sentence, Compound sentence, If an octopus needs to hide, it can change its color., Complex sentence, Compound sentence, Simple sentence, There are many stars in the sky, but we cannot see all of them., Compound sentence, Complex sentence, Simple sentence, Although there are billions of stars, we can see only some of them from Earth., Simple sentence, Compound sentence, Complex sentence

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