Why Did It Take So Long for Eukaryotes to Evolve

question 16

Multiple Choice

Why did it take so long for eukaryotes to evolve after photosynthetic prokaryotes began releasing O₂ into the atmosphere?

• A) O₂ moves slowly through larger cells,making it hard for them to gather O₂;thus,higher O₂ concentrations had to accumulate before eukaryotic cells could be efficiently supported.
• B) The ability to use O₂ had to evolve before cells could survive in an O₂-rich atmosphere.
• C) The ability to break down the waste products of O₂ use had to evolve before cells could use it to create energy.
• D) Enough prokaryotes had to become extinct to provide eukaryotes with a niche to occupy before they could evolve.

---

Definitions:

Interest Rates

Rates at which interest is charged or paid for the use of money, typically expressed as an annual percentage rate.

Gross Investment

The total amount of money spent on new capital assets before accounting for depreciation.

Public Investment

Expenditure by the government on capital projects like public infrastructure, education, and health facilities that are intended to improve a country's economic capacity and well-being.

Replacement Investment

Expenditures made to replace worn-out or outdated capital goods to maintain productive capacity.