Which of the following achievements BEST illustrates Maya knowledge of astronomy? A. They used slash-and-burn agriculture.
B. They built temples and pyramids.
C. They developed a complex calendar system.
D. They developed a hieroglyphic writing system.

Which examples are relevant sources for students to use in research? check all that apply. a journal entry written by a professor who is considered an expert a report written by an independent government source a presentation by a company that includes paid information a document published by a renowned organization a scientific paper put out by a non-profit organization a blog whose author tries to sell a product or service