Which prokaryotic organism shows up as the earliest fossils? asap plz

1#archaea
2#echoinoderms
3#algae
4#cyanobacteria

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?