Which of the following was probably the least important factorin bringing about the Cambrian explosion?(A) the emergence of predator-prey relationships(B) an increase in the concentration of atmospheric oxygen(C) the movement of animals onto land(D) the origin of Hox genes

Along comes Dr Phil Bell and deep in the mines of Lightning Ridge, finds an amazingly preserved pterosaur that preserves feathers. He hypothesises that this means that feathers must have evolved before the origin of dinosaurs and therefore must have been primitive. Test this hypothesis using phylogenetic framework and provide a brief explanation of your process and whether or not you support Dr Bell's hypothesis.

Chimpanzees are most closely related to years ago. (A) bonobos (B) Can't Tell (C) orangutans (D) gorillas (E) humans with whom they last shared a common ancestor approximately 2 million

If you as a paleoanthropologist are plannin an excavation at a hominin site in East Africa which is dated to about 2 million years old, which fossil hominin species might you expect to find?