A2-year-old boy swallows a penny. the boy's mother checks his stool for several days, but the penny does not appear. meanwhile, the boy has lost his appetite and seems to have difficulty eating. when a foreign object is swallowed, it often lodges at which portion of the gut?
anus
duodenum
ileocecal sphincter
lower esophageal sphincter

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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i think its c. amphipod

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