Examlex
The Duke studies of aging involved the selection of separate groups of adults aged 45, 50, 55, 60, and 65. Each group was then retested at year intervals for a total of 6 years. This is an example of what general type of research design?
Metatheria
A taxonomic group of mammals, commonly known as marsupials, characterized by giving birth to partially developed offspring that typically complete their development in the mother's pouch.
Hemichordates
A group of marine animals closely related to chordates, characterized by having a body divided into three parts: a proboscis, a collar, and a trunk.
Deuterostomes
A group of animals characterized by the development of the mouth from an opening other than the blastopore during embryonic development.
Derived Characteristics
Traits that are present in an organism but were absent in the last common ancestor of the group to which the organism belongs.
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