Weegy: could you please elobrate your question? User: Europe Asia Africa Middle East User: The era in which early humans made tools is called the _ Weegy: The first human remains were discovered in Herto, Ethiopia and are believed to be 160,000 years old. User: What species first appeared to walk upright? (More)

Weegy: Soil User: _____ converts ammonium into nitrates, while _____ converts nitrates into nitrogen gas. Weegy: results in nitrates being converted to nitrogen gas and returned to [ ] (More)

Weegy: The Mid-Atlantic Ridge is an example of what is called a slow-spreading mid-oceanic ridge system, which typically is broad with a deep, central rift valley. [ [ (Fast-spreading systems are more typical of the Pacific Ocean, where deep trenches are more common than in the Atlantic.) New seabed is continually being formed from the spreading ridge, which creates relatively shallow areas in the middle of the Atlantic above the extremely flat abyssal plains that begin at the margins of the continental shelves. ] ] (More)

Weegy: Most energy in an ecosystem comes originally from the Sun. User: You are a _____ consumer if you feed on secondary consumers. Weegy: B Primary User: About how much energy is transferred between a producer and primary consumer? (More)

Weegy: Homo erectus is believed to be the first species found outside Africa (where the species probably originated). (More)