What organisms in the lake produce oxygen that dissolves in the water?

we need additional information in order to determine the cause of death for anna garcia. there are at least 3 things with explanation included as to why we need them are as follows:

b. safety skills, for handling tools and food products, and honesty, for following rules and regulations

explanation:

you do not need teaching skills if you work at a processing factory. you also don't need accuracy for closely inspecting equipment and operating heavy machinery safely if you are working at a processing factory. and lastly, you don't need accuracy for monitoring animals, and patience and determination, for observing and caring for animals. if you work at a processing factory, you don't need to care for animals.