Scientists who study races and their origins are called
a. anthropologists.
b. ethnologists.
c. paleontologists.
d. sociologists.

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Write the correct abbreviation for each metric unit

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f