What is the difference between ostia and osculum?

Osculum: A large opening in a sponge through water flows out of the sponge. the sponge may have more than one Osculum.

Ostia: A series of tiny pores all over the body of a sponge that let water into the sponge. One of these is called Ostium. 

This bacteria must be very strong as it has a large amount on antibiotic targeting it. this bacteria could be one of many different types and it is very hard to tell which one with out more information.

An ecosystem is in a certain area and includes living and non living plus there is weather conditions and a biome is a large amount of area with similar climate.so ecosystem is based on weather and biome is based on the average climate