People who stop a they had been using habitually can experience symptoms such as fatigue and trouble sleeping. What is this called? A. withdrawal b. addiction c. physical dependence d. psychological dependence

What was bohr’s contribution to the planetary model

What does an electron configuration for an atom relate to the atoms placement on the periodic table

Ariver current has a velocity of 5km/h relative to the shore, and a boat moves in the same direction as the current at 5 km/h relative to the river. how can the velocity of the boat relative to the shore be calculated?