What have we learned about the way the universe expands from the recent sn observations?

Suggest two reasons why irrigation is important for human development of the desert (4 marks)

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Rainbow trout is non- native to the united states. however this species is breeding with the native gula yltrout acientistrecently observed that the hola trout were becoming exitinct what is the cause of their extinction