The body of each organism is organized in a certain manner. Which of the following shows the organization of the body from the simplest level to the most complex level? A. organ --> tissue --> cell --> organ system --> organism B. organism --> organ system --> organ --> tissue --> cell C. cell --> tissue --> organ --> organ system --> organism D. tissue --> cell --> organ system --> organ --> organism

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.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms