Iwill give 20 points scientists have determined that the oldest fossils, representing earth’s earliest life-forms, are 3.5 billion years old. which description of these life-forms is accurate? a. reddish eukaryotic cells b. blue-green photosynthetic bacteria c. orange-colored protists d. multicellular organisms, mostly blue in color

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?