Auroras are lights that appear at earth’s northern and southern poles. what is the main cause of an aurora? 1.solar wind enters earth’s atmosphere, and particles interact with ions. 2.bubbles of gas are ejected from earth’s outer crust. 3.sunlight reflects off the surface of the moon during an eclipse. 4.the northern and southern poles are cooler than the rest of earth.

THE ANSWER IS A./Solar wind enters Earth’s atmosphere, and particles interact with ions.

Explanation: I DID THE TEST ;)

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