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#Question id: 8926

Sponges and cnidarians are among the fossilized animals found in both the Ediacara Hills and the Burgess Shale from the Rocky Mountains of British Colombia. This observation requires that

#XL - R Botany

ancestral sponges and cnidarians had formerly been terrestrial animals.
North America and Australia were united to each other about 550 million years ago (mya).
land that now comprises the Ediacara Hills and the Rocky Mountains was underwater about 550 million years ago.
only sponges and cnidarians existed at the time the sediments were deposited.

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#Question id: 4956

#XL - S Microbiology

Which measurement would help determine absolute dates by radiometric means?

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#Question id: 19564

#XL - P Chemistry

In a borax bead test, which compound is formed?

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#Question id: 510

#XL - S Microbiology

2,3-bisphosphoglycerate is

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#Question id: 29401

#XL - R Botany

The life cycle in bryophytes is

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#Question id: 2140

#XL - T Zoology

According to the current model for HIV infection, which of the following is not involved in the process of membrane fusion?