Examlex
Select the letter of the sentence that is correctly punctuated with commas. Which sentence is correctly punctuated?
Short-lived Isotopes
Radioactive isotopes that decay rapidly, often used in medical imaging and studies of geological and planetary processes.
Long-lived Isotopes
Isotopes that have a long half-life, persisting in the environment for extended periods, often used in dating or tracing studies.
Emergence of Land Plants
The period in Earth's history when plants first developed and colonized land, around 500 million years ago during the Ordovician period.
Wattieza
An extinct genus of trees from the Middle Devonian period, recognized as one of the earliest known trees and an important part of Earth's prehistoric forests.
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