What Is the Predominant Hypothesis to Explain Why Animals Only

question 101

Multiple Choice

What is the predominant hypothesis to explain why animals only appeared in the fossil record about 3 billion years after life originated?

• A)There were animals 3 billion years ago, they just weren't fossilized.
• B)Animals are warm-blooded, and the ocean was too cold for animals to evolve 3 billion years ago.
• C)Animals large enough to be recorded in the fossil record could not evolve until oxygen reached levels sufficient to support aerobic respiration.
• D)Animals are heterotrophic and couldn't evolve until there were enough photosynthetic organisms on Earth to support being eaten by animals.

---

Definitions:

Unobservable Actions

Actions taken by individuals or entities that cannot be seen or measured directly, often inferring effects through outcomes or reports.

Moral Hazard

A situation in economic transactions where one party is willing to take risks because the negative consequences of the risk will be borne by another party.

Health Care Insured

Refers to individuals or entities that are covered under a health insurance plan, providing financial protection against medical expenses.

Diet And Exercise

A combined approach of nutritional intake and physical activity designed to improve or maintain health and fitness.