Red shift
cosmic microwave background radiation
the amount of hydrogen in the universe

all indicate that the universe is
a) rotating.
b) expanding.
c) shrinking.
d) at equilibrium.

What did hunter gathers do to alter the environment?

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

Is there any solid scientific evidence that humans have been cloned?