Underwater plants have thin and narrow leaves without stomata. In such plants, how does exchange of gases take place ?

Does anyone know what the schooling version of sos mean? example

Three applications for admission to a local university are checked, and it is determined whether each applicant is male or female. the number of sample points in this experiment is

Some plants release toxic chemicals that kill or harm nearby plants. what type of example is this? 1 cooperation 2.mutualism 3.competition or 4.parasitism