Some Globular Clusters Have Three Main Sequence Tracks

question 29

Multiple Choice

Some globular clusters have three main sequence tracks. This indicates:

• A)three different stellar compositions.
• B)three episodes of star formation, separated by billions of years.
• C)stars evolve through three different mechanisms.
• D)the stars were observed from three different telescopes.

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Definitions:

Bony Fish

A group of fish characterized by having a skeleton primarily composed of bone rather than cartilage.

Ray-Finned Fish

Aquatic vertebrates characterized by fins supported by bony spines or rays, constituting the largest group of fish.

Coelacanth

An ancient order of fish thought to be extinct for millions of years until a living specimen was found in 1938, known for its lobed fins.

Extraembryonic Membranes

Tissue layers formed outside the embryo that provide protection, nutrition, waste removal, and gas exchange for the developing fetus.