Large Amounts of Oxygen Gas First Appeared in Earth's Atmosphere

question 13

Multiple Choice

Large amounts of oxygen gas first appeared in Earth's atmosphere about ________ of years ago.

• A)thousands
• B)millions
• C)billions
• D)hundreds

---

Definitions:

PSAT/NMSQT

The Preliminary SAT/National Merit Scholarship Qualifying Test, a standardized test that provides firsthand practice for the SAT and offers the chance to qualify for National Merit Scholarships.

National Merit Scholarship

A prestigious academic competition for recognition and university scholarships that high school students in the United States enter by taking the Preliminary SAT/National Merit Scholarship Qualifying Test.

Education For All Handicapped Children Act

The Education for All Handicapped Children Act was a landmark legislation in the United States that required all public schools accepting federal funds to provide equal access to education for children with physical and mental disabilities.

Least Restrictive Environment

A principle in special education that students with disabilities should be educated to the maximum extent appropriate with peers who do not have disabilities.