HELP PLISS The existence of which group of organisms spans the shortest geologic time?

A)
birds

B)
humans

C)
dinosaurs

D)
placoderm fish

Differences between compact bone and cartilage

Achild is suffering from fever but the doctor cannot immediately pinpoint the alignment on the basis of this one symptom explain why also mention other two such general symptoms

Which feature would you expect to find in a population in which sexual selection depends on male competition?