A scientist read about an experiment done by someone else. She does the same experiment in her lab to make sure it works.

This is an example of
A.
redundancy.
B.
replication.
C.
replacement.
D.
repetition

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules