(HELP PL TELL ME! THIS IS SCIENCE)Which statement belongs in the region marked X?

A) occurs only in cases of volcanic activity
B)changes occur gradually
C)begins when lichens populate an area
D)results in a reduction of the number of species

i believe the answer is a or 1

bc blah

explanation:

bc blah

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

answerdendrites; blank(2) axons;