Oxygen Isotopes Are Often Used to Estimate Changes in Paleoclimate

question 18

Multiple Choice

Oxygen isotopes are often used to estimate changes in paleoclimate by measuring the ratio of ¹⁸O to ¹⁶O in ice cores.If the ¹⁸O/¹⁶O ratio is high,this indicates a(n) ________.

• A)icehouse condition
• B)snowball Earth
• C)polar climate
• D)warm climate

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Definitions:

Obturator Nerve

A nerve in the pelvic region that innervates the adductor muscles of the thigh.

Adduct Thigh

To adduct the thigh means to move the thigh inward towards the median axis of the body, a movement controlled by adductor muscles.

Iliopsoas

A compound muscle composed of the iliacus and psoas major muscles, crucial for flexing the hip.

Sartorius

The longest muscle in the human body, running down the length of the thigh; it aids in flexing, abduction, and lateral rotation of the hip, and flexion of the knee.