By the Time the Universe Was a Few Minutes Old,the

question 6

Multiple Choice

By the time the universe was a few minutes old,the majority of the normal matter in the universe was hydrogen,and the remainder was mostly ________.

• A) helium
• B) neutrons
• C) neutrinos
• D) protons

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Definitions:

Fertilization

The process in which a sperm cell unites with an egg cell to form a zygote.

Polyspermy

The fertilization of an egg by more than one sperm, which can lead to developmental abnormalities.

Germ Layers

Germ layers are the three primary layers of cells (ectoderm, mesoderm, and endoderm) in the early embryo that give rise to all the tissues and organs of the body during development.

Amniotic Cavity

The fluid-filled space within the amniotic sac, surrounding and protecting the developing fetus during pregnancy.