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

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.

Dna replication or repair occurs in a cell in all of thw following situations except when

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a.coral reefs because of the loss of the symbiotic algae living within their bodies b.penguin populations because the fish they eat will move into warmer waters c.mountain-dwelling birds because rising sea levels will relocate their food sources d.large cats in the rainforest because of decreased habitat loss for their prey