When the Heart Begins to Beat in the Developing Embryo

question 77

Multiple Choice

When the heart begins to beat in the developing embryo,

• A) it is usually during the fourthweek after conception.
• B) the organism weighs a fraction of an ounce.
• C) the organism is only two to three inches in length.
• D) the endoderm is fusing with the ectoderm.

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