Which subshell is represented by the lanthanides series

In saturated organic compounds, all the bonds between carbon atoms are called?

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

Which of the following units is not an official si unit? mole liter kilogram ampere