The earliest discovered fossils are of ________ dating back to ________ years ago.?
CH 15:1
Question 1
Which of the following environments is thought to have promoted the dehydration synthesis of polypeptides and other macromolecules from smaller organic monomers on a prebiotic Earth?
a.quiet saltwater bodies
b. hot sand, clay, or rock along seashore
c. sediments at the bottom of the worlds oceans
Question 2
The earliest discovered fossils are of ________ dating back to ________ years ago.
a. prokaryotes…3.5 billion
b. algae…1billion
c.fish…600 million
d.dinosaurs…180 million
Question 3
A(n) ________ has been used to estimate that HIV-1 M first spread to humans in the 1930s.
a.epidemiological study
b.parsimony analysis
c.molecular clock —-this is the right answer
Question 4
How can the success of one group of organisms promote the adaptive radiation of a second group?
a. by competing with the second group, promoting its adaptive radiation
b. by preying on the second group, which hastens its adaptation
c. by filling most of the available niches, which forces the second group to evolve greater diversity
d. by providing new food resources, habitats, etc. for the second group
Question 5
One of the strongest lines of evidence of a meteor or comet impact in the late Cretaceous is
a. the increase in the diversity of mammals.
b.a thin layer of iridium-enriched clay in late Cretaceous fossil strata.
c.the warming of Earth’s climate in the late Cretaceous.
d.a thin layer of potassium-40 in late Cretaceous fossil strata.
Question 6
Mass extinctions:
a. mainly serve to "weed out" poorly adapted organisms and make room for new, more advanced species.
b. remove many species, but they are replaced within a million years or less by an even greater diversity of life.
c. remove well-adapted species and groups from the Earth, so that it may take tens of millions of years for species diversity to recover.
d. permanently and irreversibly reduce the total number of species on Earth.
PLease help Im studying for a test
I cant find these answers anywhere. –PLease dont guess. Thank you
Filed under: Potassium and Being Sick
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I can’t answer all of them…
but no one else seems to be answering any of them, and I can see that a couple of my fellow Ladder Top Contributors have passed this one by.
So here’re the ones I can answer:
Question 2
The earliest discovered fossils are of ________ dating back to ________ years ago.
Here’s the one you’re looking for.
a. prokaryotes…3.5 billion
The thing is, the fossils aren’t of the prokaryotes themselves, but rather of the mass of crud that accumulates around them. LOL. Google for
stomatolites
Question 4
How can the success of one group of organisms promote the adaptive radiation of a second group?
d. by providing new food resources, habitats, etc. for the second group
The idea here is that "adaptive radiation" leads to several (or lots of) species from a common ancestor. Think about trees providing habitat for beetles.
Question 5
One of the strongest lines of evidence of a meteor or comet impact in the late Cretaceous is
The answer you’re looking for is
b.a thin layer of iridium-enriched clay in late Cretaceous fossil strata.
It’s not a great answer. This clay is actually the dividing line, and therefore is above Cretaceous strata.
Question 6
Mass extinctions:
c. remove well-adapted species and groups from the Earth, so that it may take tens of millions of years for species diversity to recover.
What you should learn from this is that well-adapted species are well-adapted to their environment. If the environment changes suddenly and drastically, then many species will just die out because they’re not well-adapted to the new conditions.