Why do marine scientists examine age structure?
o it provides insight into the future of the species.
it is very difficult to tell the age of sea creatures.
o it is a good sign if most of the population is very old.
o it is important for determining where in a region a species lives.

answer; i believe the correct answer is (a)0

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

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 

i do believe the correct answer would be the third one. location c, because earth is tilted away from the sun at this time

hope this