Sb-22 when must you maintain a proper lookout by sight and hearing?

According to navigation rules and regulations, you are expected to maintain a proper lookout by sight and hearing at all time. Concerning looking out, the law states that 'every vessel shall at all time maintain a proper look out by sight and hearing and as well as by all appropriate means available in order to avoid the risk of collision'.   

D.release of water from the vacuoles

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for