What Is the BEST Way to Estimate the Age of a Star

question 134

Multiple Choice

What is the BEST way to estimate the age of a star cluster?

• A) Plot the stars on a Hertzsprung-Russell diagram and see which stars are still on the main sequence.
• B) Measure the motions of the stars in the cluster and compare the measurements with theoretical models.
• C) Measure the heavy element abundance for the stars in the cluster.
• D) Count the number of T Tauri stars in the cluster.

Recognize the role of predictability and timing in the conditioning process.

Understand the phenomena of extinction, spontaneous recovery, and generalization within classical conditioning.

Demonstrate knowledge of how conditioned emotional responses are developed and their impacts.

Comprehend the biological constraints on classical conditioning.

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Definitions:

Prenatal Nutrition

The dietary and nutritional considerations and requirements during pregnancy, critical for the health and development of the fetus.

Embryo

An embryo is an early stage of development in multicellular organisms, in humans, it refers to the phase of prenatal development between conception and the fetal stage.

Cocaine

A powerful, addictive stimulant drug derived from the leaves of the coca plant, which is native to South America.

Stillbirth

The delivery of a baby who has died in the womb after 20 weeks of pregnancy, distinguished from earlier pregnancy loss, which is typically referred to as a miscarriage.