Mandibular Premolars

What shape can be seen from the facial view of the Mandibular first premolar ?

Which buccal cusp ridge is shorter ? MB or DB

Is the mandibular 1st premolar the variable in size of any premolar ?

is the lingual cusp larger or smaller ?

Is there a mesial ligual groove?

Is the 1st mandibular premolar trapezoidal or rhomboidal ?

Is the buccal tip or the lingual tip located over the root ?

from the mesial veiw what is the lingual incline in terms of degrees ?

What is the occlusal shape of the first mandibular premolar ? 

How much of the space does the buccal cusp occupy ?

How to tell the difference between the first and second mandibular premolar ?

How many cusps does the second mandibular premolar usually have ? Where are they placed ?

Mandibular second premolar cusp variety and number of cusps ?

Can the second premolar be missing congenitally ?