What Is the Age of the Oldest Hominin Tools Found

question 56

Multiple Choice

What is the age of the oldest hominin tools found so far?

• A) 1.7 million years ago
• B) 3.3 million years ago
• C) 0.3 million years ago
• D) 0.2 million years ago

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Definitions:

Gonadal

Relating to the gonads, the organs that produce gametes (sperm in males and ova in females) for reproduction.

Calcitonin

A hormone produced by the thyroid gland that lowers blood calcium levels by activating osteoblasts.

Thyroid Gland

An endocrine gland, consisting of irregularly spheroid follicles, lying in front and to the sides of the upper part of the trachea, in a horseshoe shape, with two lateral lobes connected by a narrow central portion, the isthmus; occasionally an elongated offshoot, the pyramidal lobe, passes upward from the isthmus in front of the trachea. It is supplied by branches from the external carotid and subclavian arteries, and its nerves are derived from the middle cervical and cervicothoracic ganglia of the sympathetic system. It secretes thyroid hormone and calcitonin.

Steroidal

Relating to or characterized by the presence of steroids, which are a large class of organic compounds with a characteristic molecular structure.