Why are archaea in a different domain from bacteria?

a. they had independent evolutionary development.

b. they shared a common ancient ancestor.

c. they are eukaryotes, but bacteria are prokaryotes.

d. they are multicellular, but bacteria are unicellular.

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.