I think it is ability to make tools
there was no oxygen in Earth's early atmosphere.
i think the human race was made by god
30,000
DNA I think
I think it's illegal. Scientists have noticed that there are more birth defects,early sicknesses and die earlier so they are afraid of the result it will have on a human.
The development of humans that walk upright and opposable thumbs. It helped scientists classify us as modern humans.
false
Scientists are unsure about how the first people came to the Americas because there are various theories with limited concrete evidence. The vast time span, limited archaeological records, and differing migration routes all contribute to the uncertainty. Additionally, the complex nature of human migration patterns further complicates our understanding of early settlement in the Americas.
to find riches
Because they are scientists
I think that scientists have changed the classification system since it was first developed because, the world has grew example technology and they wanted to update it. I also think scientists have changed the classification system since it was first developed to make it easier.
Bacteria were the first cells.