What was the main challenge of growing crops in much of the great plains in the 1800s?

Which statement describes a similarity between the great migration and to this day

Both the nervous and endocrine systems send electrical and chemical signals for internal communication. select the best answer from the choices provided t f

President of the united states has scheduled a cabinet meeting today to discuss energy policy with specific focus on pollution and global warming. given what you know of the executive branch, which group of attendees would the president most likely expect to provide up-to-date information and expert insight during this meeting?