Are races of people like breeds of dogs? is it true that dogs diverged 15,000 years ago while humans diverged 50,000 years ago?

Which is the best example of plant tissue? the answer is d (just took the test)

Northern switzerland has a fairly cold climate caused by sea winds from the atlantic ocean but souther switzerland tends to be much warmer and sunnier, what could cause this difference?

Achange in which factor will affect the rate of reaction only when gases are involved? temperature pressure surface area concentration