Answer:
1. Answer: Light can travel in a vacuum, and its speed is constant if the source is moving or stationary.
Light travels at constant speed in vacuum even if the source is moving or stationary. If the source is moving, the apparent frequency/ wavelength changes.
Blood cells more then any other factor notice water doesn't have any cells in it and it flows freely and quickly.
Answer:
I believe it would either be A or D hope that helps sorry not much help
XX if female and XY is male