Calculated Theoretical yield of iron was 365 grams but the measured yield was 278 what's the percent of yield

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

The biosphere of the earth is made up of what compound? organic or inorganic?