High Levels of ¹⁸O in Now-Fossilized Foraminifera Shells Indicate

question 43

Multiple Choice

High levels of ¹⁸O in now-fossilized foraminifera shells indicate

• A)an increase in temperature.
• B)a decrease in temperature.
• C)an increase in oxygen.
• D)a decrease in oxygen.

---

Definitions:

Functional MRI

A neuroimaging procedure that measures brain activity by detecting changes associated with blood flow, used to observe the functioning of the brain.

EEG

Electroencephalogram, a test that detects electrical activity in your brain using small, flat metal discs (electrodes) attached to the scalp.

Pineal Gland

A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep patterns.

Endocrine Gland

Glands of the endocrine system that release hormones directly into the bloodstream.