The doppler effect is the change in observed frequency due to

a. the original frequency of the source.

b. the type of medium the wave is in.

c. the motion of the source or observer.

d. the type of wave.

e. all of the above

What contributed most to the decline of native american civilizations in latin america after the arrival of european explorers?

A fastfood chain makes the decision to rebrand itself as a midrange adult café instead of a cheap kidfriendly restaurant. This change will involve using higherquality ingredients and renovating to remove children's playgrounds.

Coal is derived from which of the following materials?

Gaia glances over at her roommate, who is on the phone with her mother. She watches as her roommate's facial expressions change from happy to sad to angry as she progresses through the phone conversation.

Which event created a need to pass the 14th Amendment? A. colfax Massacre B ending segregation C attack on the Cabildo D passing Black Codes

Which of the following will you most likely find in an historical novel such as Johnny Tremain

Who is Anaxagoras siblings? (if he has any)

Emily is a successful entrepreneur. as such, she is likely to

Which pre-Columbian civilization was located farthest south?

Strictly speaking, why does god not owe us anything?