How Many Sets of Emission Regulations Are Used in the US

question 4

Multiple Choice

How many sets of emission regulations are used in the US?

• A)1"
• B)2"
• C)3
• D)4"

---

Definitions:

Genus Homo

The genus to which modern humans belong, characterized by higher mental faculties, upright posture, and bipedal locomotion.

Oldowan Tools

The earliest known stone tool industry, dating back to about 2.6 million years ago, associated with Homo habilis and used by early hominins for cutting, scraping, and processing animal and plant materials.

Homo Floresiensis

A species of small hominin that lived on the island of Flores, Indonesia, until about 50,000 years ago, known for its relatively small stature and brain size.

Homo Habilis

An extinct species of early human that lived about 2.4 to 1.4 million years ago, known for using stone tools.