All of Earth's Life-Forms Are Based on

question 13

Multiple Choice

All of Earth's life-forms are based on

• A) hydrogen.
• B) nitrogen.
• C) oxygen.
• D) carbon.
• E) phosphorus.

---

Definitions:

Research Methods

The systematic plans, techniques, and approaches used to gather, analyze, and interpret data in scientific studies.

Descriptive

Pertaining to the act of describing or providing detailed information about characteristics, events, or phenomena.

Correlational

Pertaining to a research method that examines the relationship between variables without inferring a causational link.

Experimental

Relating to a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.