Answer:
4.- oh shoot my dad is calling me brb ok im back so i think the answer HOLY **** my girlfriend keeps nagging me
Explanation:
When you keep raisin in water and the raisin gets puffed.
Movement of salt-water in animal cell across our cell membrane.
Answer:

Explanation:
Given that,
The speed of an electromagnetic wave traveling in a transparent nonmagnetic substance is given by :

Where
k is the dielectric constant of the substance.
v is the speed of light in water


So, the speed of light in water is 