Can an essay have 1 paragraph?

It should have at least 4

1-Introduction-Topic sentence(s)

2-Body-1 piece of information and 2 details that refer to the piece of information

3-Body-1 more piece of information and 2 details that refer to the piece of information

4-Conclusion-Wrapping up your essay, must tie to the beginning sentence

EXAMPLE OF GOOD CONCLUDING AND TOPIC SENTENCE: Have you ever wondered how babies are made? This is how babies are made

EXAMPLE OF BAD CONCLUDING AND TOPIC SENTENCE: I like monkeys. Pie tastes good.