Examlex
Even though the death rate from __________ has declined by 50% during the past 35 years, it is still the number one cause of death in the United States.
Invertebrates
Animals that lack a vertebral column or backbone, including groups such as insects, mollusks, and arachnids.
Chordate Evolution
The study of how chordates, a vast group of animals that includes vertebrates, have evolved over time.
Absolute Dating
A method of determining the age of an object or material, often by measuring the decay of radioisotopes.
Radioisotopes
Isotopes of elements that are radioactive, undergoing decay and emitting radiation in the process.
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