Examlex
What is the term for inflammation of the sac that encloses the heart?
Prokaryotic Cells
Simple, single-celled organisms without a nucleus or other membrane-bound organelles, such as bacteria.
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.
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