Who Made Humans and Dinosaurs?

Who made humans and dinosars appeared long time ago?
- Anna (age 14)
hONG kONG

The currently accepted scientific opinion is that both humans and dinosaurs evolved over many millions of years from very basic chemical constituents present in the early earth epoch. The evolutionary path is quite complex but fossils found in many locations all point to a time sequence of events that make sense.  Since our sun and the planet earth have been around for four billion years there has been plenty of time for this process to have occurred.  There are many web sites that contain relevant information, a good starting point is:


LeeH

(published on 03/04/2008)

Where was first human live in world
- Abdul samad (age 18)
pakistan

It's a little hard to say much precise about "the first human" because it's not clear where you choose to draw the line between humans and pre-human ancestors. Nevertheless, for any common choice of where to draw that line, the first humans evolved in Africa. The main line of our ancestors branched off from other relatives very roughly 150,000 years ago in Africa. As they spread out, they interbred a little bit with other groups (including Neanderthals) that had branched off earlier, up to about 800,000 years ago. (My personal ancestry is about 3% Neanderthal and Denisovan.)

Even if you choose a much earlier branching time for the whole collection of our close relatives from other apes, they all go back to Africa. Our last shared ancestor with chimpanzees lived very roughly 7,000,000 years ago, in Africa.

Mike W.

(published on 02/20/2014)