Which of the Following Is Considered a Likely Explanation for the Events

question 30

Multiple Choice

Which of the following is considered a likely explanation for the events of the Cambrian explosion?

• A)A great surge of volcanic activity was triggered by significant movements of the continental plates and possibly by an asteroid impact.
• B)The massive growth of swamp vegetation depleted the atmosphere's carbon dioxide and eventually cooled the Earth's climate.
• C)Complex predator- prey relationships and increased atmospheric oxygen levels promoted animal diversification.
• D)Solar flares led to increased UV radiation intensity,which in turn promoted a high rate of mutation.This led to rapid diversification of animals.

---

Definitions:

Monthly Schedule Depositor

A designation for businesses that are required to deposit employment taxes on a monthly basis, typically when their tax liability in a lookback period exceeds certain thresholds.

Tax Liability

The total amount of tax owed to the IRS or other tax authorities after all deductions, credits, and exemptions.

Semiweekly Depositor

A semiweekly depositor is a business that must deposit employment taxes on Wednesdays or Fridays, depending on the day wages are paid, due to the size of its payroll.

FICA Withholding

Refers to the payroll taxes automatically deducted from an employee's paycheck to fund Social Security and Medicare programs.