A Body Plan Consisting of Repeating Segments,which Are Modified During

question 68

Multiple Choice

A body plan consisting of repeating segments,which are modified during development into structures such as vertebrae,ribs,and muscles,depends on modification of early developmental structures called

• A) interneurons.
• B) somites.
• C) parenchyma.
• D) neural crest cells.
• E) lateral plate mesoderm.

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Definitions:

Conception

The formation of an idea or the beginning of a pregnancy when a sperm fertilizes an egg.

Organogenesis

The phase of embryonic development in which the organs of the body are formed, occurring after gastrulation.

Trimester

A term divided into three parts, often used to describe the three roughly three-month periods into which pregnancy is divided.

Toxic Chemicals

Substances that are harmful or deadly to living organisms when introduced into the environment or the body, often through pollution or contamination.