URGENT - This is not really specific but I have a chemistry test really soon and I still don't understand how to balance chemical equations.. I've watched every video and tried practicing but I just still can't understand. Can someone help, please? 30 points will be given out + a brainliest answer will be picked

Five students had to answer the question how are elements arranged in a periodic tabledamon: i think the elements are arranged by increasing massflo: i think the elements are arranged according to their properties sienna: i think the elements are arranged by when their discovers kyle: i think the elements are arranged according to how common they areglenda: i don't agree with any of themwho is right

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.