In Developing Humans, the First Trimester Is a Time of Extreme

question 257

Multiple Choice

In developing humans, the first trimester is a time of extreme sensitivity to environmental risks, because

• A) the placenta is most efficient at this time.
• B) the embryo is very small at this time.
• C) tissue differentiation is occurring at this time.
• D) it is a period of dramatic growth.
• E) the organ systems are maturing and particularly sensitive to disruption at this time.

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A naturally occurring, flammable liquid found in rock formations, composed of a complex mixture of hydrocarbons and used as a fuel and in the production of various chemicals.

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The amount of energy used to produce goods or services, an important factor in the efficiency and environmental impact of production processes.