Which Event Was Most Directly Responsible for Increasing Oxygen in Earth's

question 67

Multiple Choice

Which event was most directly responsible for increasing oxygen in Earth's atmosphere?

• A) The cooling of the planet
• B) The emergence of eukaryotes
• C) The development of multicellularity
• D) The evolution of photosynthesis
• E) The rise of prokaryotes

---

Definitions:

Business Transactions

Acts of trading or dealing involving the exchange of goods, services, or financial assets between two or more parties.

MICR Recording Area

A section on checks encoded with magnetic ink character recognition technology to facilitate the electronic processing of bank checks.

Routing Number

A nine-digit code used in the United States to identify a financial institution in a transaction.

ABA Number

A fraction appearing in the upper-right corner of all printed checks that identifies the geographic area and specific bank on which the check is drawn.