The bacteriologist sir alexander fleming was engage in the study of staphyococcus a kind of bacteria that wa being grown in petri dishes . that's when he noticed the peniciin mold that was aso growing in some culture dishes. there was a clear area around the penicilin . sir alexander hypothesised that the penicillin mold could be producing a chemical that kills bacteria. o he decided to test his hypothesis by isolating the chemical and testing it to see if it would really kill bacteria . he transferred it to a solution of nutrient broth that contained the elements necessary to it's growth . once the mold flourished , he removed it from the broth and transferred the broth to a culture of bacteria. the bacteria died as a result. this discovery was used to develop several kinds of antibiotics that treated several deadly diseases. what is the problem here ? what is the hypothesis?

The problem is that mold was growing in some of the dishes. The hypothesis is that the mold can cure bacteria.

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.