What is the origin of pioneer species in primary succession?

a) they immigrate from other areas
b) they are survivors of the ecological disturbance
c) they evolve from other organisms already present
d) they are present in the remains of dead organisms

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

Why do we perceive objects as retaining their brightness under different lighting levels?

Select the correct answer from each drop-down menu proteins are