Evaluate
- ${ } _ { 5 } \mathrm { P } _ { 1 }$

question 71

Multiple Choice

Evaluate.
- ${ } _ { 5 } \mathrm { P } _ { 1 }$

• A) 48
• B) 5
• C) 120
• D) \(2.5\)

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Definitions:

Ectoderm

The outermost layer of an embryo in early development, giving rise to the nervous system and external skin layers.

Hypoblast

The layer of cells inside the blastocyst (an early stage of the embryo), which contributes to the formation of the yolk sac and is involved in early embryonic development.

Epiblast

A layer of cells derived during the early development of an embryo, giving rise to all three primary germ layers.

Fertilization

Process that begins with the penetration of the secondary oocyte by the spermatozoon and is completed with the fusion of the male and female pronuclei.