In 1980, a group of scientists from the university of california at berkeley found an unusually high concentration of iridium in a rock layer thought to be 65 million years old. iridium is rare on earth, but is sometimes found in meteorites. similar iridium deposits in similarly aged rock were found all over the world. the evidence above supports which hypothesis? a) glacial movement ceased 65 million years ago. b) an asteroid impact started the ice age 65 million years ago. c) a giant volcanic eruption caused a mass extinction 65 million years ago. d) the earth was hit by an one or more objects from space 65 million years ago.
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Biology, 22.06.2019 01:20
Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen
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Biology, 22.06.2019 10:30
Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.
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Biology, 22.06.2019 10:50
The carrier molecules of the electron transport system are located in the
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Biology, 22.06.2019 14:10
What do we call the process when two dominant alleles are expressed and do not blend? a.incomplete dominance b.codominance c.multiple alleles
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In 1980, a group of scientists from the university of california at berkeley found an unusually high...
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