If relatively small carbonaceous chondrites from space were a significant source of Earthʹs original amino acids, then which two of these would have been most important in permitting their organic materials to survive impact with Earth?

I. Carbonaceous chondrites must contain no D-amino acids.

II. Earthʹs early atmosphere must have had little free oxygen.

III. The chondrites must have arrived on Earth before 4.2 billion years ago.

IV. Earthʹs early atmosphere must have been dense enough to dramatically slow the chondrites before they impacted.

V. The chondrites must have impacted land, rather than a large body of water.

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#Question id: 27699

#Research Methodology

Reasoning from general to particular “is called

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#Question id: 8698

#SCPH28 | Zoology

Use the figure to answer the following question.

If the figure above is an accurate depiction of relatedness, then which of the following should be an accurate statement?

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#Question id: 5748

#SCPH28 | Zoology

When a diploid organism undergoes one or more rounds of endoreduplication (resulting in a gain of more than one complete haploid set of chromosomes), the resulting cells are best described as

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#Question id: 58

#SCPH05 I Biotechnology

A covalent chemical bond is one in which ________.

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#Question id: 591

#I Life Science/ Life Sciences Group – I-V

The Michaelis constant, Km, is equal to the ________.