Observations of distant quasars indicates that the universe contains dark matter.

In africa what do they call a crop grown for direct sale and not for use?

How do hearths affect cultural diffusion? a. a hearth is the destination of cultural diffusion. b. a hearth divides a cultural region in two. c. a hearth is the beginning point of cultural diffusion. d. a hearth is the means of cultural diffusion. e. a hearth is the meeting point of two diffuse cultures.

What is the calculated distance from earth to neptune