Part A Which of the following is a direct example of the study of physiology? O Measuring heart rate and noting blood pressure Observing heart muscle cell structure under a microscope. Dissecting a heart to observe the heart chambers. O Using a dissecting microscope to view the layers of a blood vessel Submit Pr ​

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

thats not even an aswer choice

answerblank(1) epidermis; blank(2); dermis;