An atom of an element can change into an atom of another element if it is A
extremely stable and has a long life.
B
radioactive and its nucleus emits or traps particles.
C
an isotope and it contains more electrons than neutrons.
D
an ion and its atomic number is larger than its mass number.

the answer is d (apex) good luck : ))

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