Critical Evidence for the Cretaceous-Tertiary (K/T)boundary Impact Included ___________________

question 12

Multiple Choice

Critical evidence for the Cretaceous-Tertiary (K/T) boundary impact included ___________________.

• A) dinosaur fossils worldwide just above the layer of impact debris
• B) an iridium anomaly in a thin layer of rock 65 million years old
• C) recovery of very large pieces of meteorite
• D) discovery of a crater covered by jungle vegetation in Brazil

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Definitions:

Nucleotides

The basic building blocks of nucleic acids, like DNA and RNA, consisting of a sugar, a phosphate group, and a nitrogenous base.

Codon

Sequence of three nucleotides in mRNA or DNA that codes for a specific amino acid in a protein.

mRNA

Messenger RNA, a form of RNA that carries genetic information from the DNA to the ribosome, where it can be translated into a protein.

Nucleotides

Organic molecules that serve as the building blocks of nucleic acids like DNA and RNA.