**Core Concept**
The question is referring to a type of agent or substance that has both mutagenic and morphogenic effects. Mutagenic effects refer to the ability to cause genetic mutations, while morphogenic effects refer to the ability to induce the formation of tissues or organs. This concept is relevant to embryonic development, carcinogenesis, and teratology.

**Why the Correct Answer is Right**
The correct answer is a type of substance that can alter the genetic material of cells, leading to mutations, and also influence the development of tissues and organs. This is typically seen in teratogenic agents, such as certain environmental toxins or drugs, which can cause birth defects and other developmental abnormalities. The mechanism of action may involve disruption of normal gene expression, epigenetic changes, or interference with signaling pathways that regulate cell growth and differentiation.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe a substance with both mutagenic and morphogenic effects.
* **Option B:** This option is incorrect because it refers to a substance that only has mutagenic effects, without influencing tissue or organ development.
* **Option C:** This option is incorrect because it refers to a substance that only has morphogenic effects, without causing genetic mutations.

**Clinical Pearl / High-Yield Fact**
Teratogenic agents can cause a wide range of birth defects, including neural tube defects, heart defects, and limb abnormalities. Remember the classic teratogens, such as thalidomide, diethylstilbestrol (DES), and ethanol, which can cause specific types of birth defects.

**Correct Answer: D. Ethanol. Ethanol is a teratogenic agent that can cause both mutagenic and morphogenic effects, leading to a range of birth defects and developmental abnormalities.