Chapter 12 Vocabulary

Which of the following is the correct definition for an isotope?

• Atoms of an element that have the same number of protons, not neutrons.

• Atoms of an element that have the same number of neutrons, not protons.

• Cells of an element that have the same number of protons, not neutrons.

• Atoms of a compound that have the same number of protons, not neutrons.

A ​ (a)   -life is the amount of time it takes for ​half of the ​ (b)   in a sample to decay into a different ​ (c)   .

• half
• isotope
• element
• whole
• compound
• atom

Match the following types of dating.

• Natural decay rate of unstable isotopes.

• Radiocarbon Dating

• Compares the ratio of a stable isotope.

• Relative Dating

• Estimates the time an organism lived.

• Radiometric Dating

What are fossils of organisms that existed only during specific spans of time over large geographic areas?

• Regal Fossils

• Index Fossils

• Inter Fossils

• Geo Fossils

What is a representation of the history of Earth that organizes Earth's history by major changes or events?

Match the following time scales.

• Last tens of millions of years.

• Period

• Last tens - hundreds millions of years.

• Epoch

• Several million years.

• Era

What is a cloud of gas and dust in space?

• Cloud

• Ribozyme

• Nebula

• Nebulary

What are RNA molecules that can catalyze specific chemical reactions?

Which of the following types of bacteria can carry out photosynthesis?

• Cyanobacteria

• Cryptobacteria

• Dingobacteria

• Photobacteria

​ (a)   is a relationship where one organism ​ (b)   within the body of another. Both organisms ​ (c)   from this relationship.

• Endosymbiosis
• lives
• benefit
• suffer
• Endorelation
• dies