At What Point Do the Weak Nuclear and Electromagnetic Forces

question 39

Multiple Choice

At what point do the weak nuclear and electromagnetic forces split?

• A) never, they are still united
• B) at 10¹² K, when pair production starts for neutrons and protons
• C) at 10⁻⁴³ seconds, when all four forces separate as the Planck Era ends
• D) at about four seconds, when at millions of degrees hydrogen forms helium
• E) after about 10⁻¹⁰ seconds, when the temperature drops below 10⁻¹⁵ K

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Definitions:

Holoblastic Cleavage

A type of cell division in embryonic development where the entire egg is evenly divided into smaller cells, common in mammals and amphibians.

Fertilization Envelope

A protective layer that forms around the egg cell of some species immediately after fertilization, blocking additional sperm from entering the egg.

Plasma Membranes

The semipermeable membrane surrounding the cytoplasm of a cell, controlling the passage of substances in and out.

Blastula

An early stage of embryonic development in animals, characterized by a hollow sphere of cells surrounding a fluid-filled cavity.