Helium Flash Occurs

question 14

Multiple Choice

Helium flash occurs

• A) because helium is very explosive and cannot be controlled when the nuclear reactions occur.
• B) because degenerate electrons in the core do not allow the core to expand as it heats up.
• C) in Cepheid variables.
• D) in stars with masses less than 0.4.
• E) none of the above

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Definitions:

Placenta

A structure that forms within the womb during pregnancy, supplying the developing fetus with oxygen and nutrients, and eliminating its waste.

Nonshared Environmental Effect

Refers to the environmental factors that contribute to the differences in development among siblings within the same family.

Teratogens

Substances or factors that can cause congenital deformities or developmental abnormalities in an embryo or fetus.

Blastocyst

An early stage in the development of an embryo, consisting of a sphere of cells surrounding a fluid-filled cavity, before implantation in the uterus.