Examlex
An endocrinologist wants to study testosterone levels in a certain group of males. Which of the following best describes sources in which testosterone can be found and used in this study?
Teeth
Hard, calcified structures in the mouths of many animals, including humans, used for biting, tearing, and grinding food.
Homo Erectus
An extinct species of humanoids that lived approximately 1.9 million to 110,000 years ago, known for upright posture and significant brain growth compared to earlier hominins.
Genus
A rank in the biological classification system, higher than species and below family, used to group species that share common characteristics.
Hominin
Any of a group of extinct and living humans. Also called hominid.
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