All of the following are examples of chemical reactions EXCEPT * Water changing from liquid to steam
Apple turning brown from oxygen hitting it
baking soda and vinegar creating bubbles
cellular respiration creating energy

Which of the following is the best definition of a eukaryota? a. a one-celled organism that does not have a membrane-bound nucleus b. a one-celled organism that does not have a cell wall c. an organism whose cells each contain a membrane-bound nucleus d. an organism whose cells each have a cell wall