Why Do Harmful Agents Cause the Most Severe Birth Defects

question 29

Multiple Choice

Why do harmful agents cause the most severe birth defects during the embryonic period?

• A) This is a period of rapid differentiation when cells and tissues acquire specific functions and organs form.
• B) This is the period when substances pass most easily through the placenta.
• C) The mother's hormones are at the highest levels at this time.
• D) The embryo has not yet implanted into the uterus.

---

Definitions:

Marginal Cost

The rise in expenses incurred by the production of an extra unit of a product or service.

Competitive Market

A market structure characterized by a large number of buyers and sellers, where no single participant has significant market power.

Sales Volume

The quantity of goods or services sold by a company within a specific period.

Price

The quote of currency expected, called-for, or donated as payoff for something.