When a Chemical Signal from a Group of Embryonic Cells

question 46

Multiple Choice

When a chemical signal from a group of embryonic cells causes a different, nearby group of cells to embark on a particular developmental course (say, differentiating into a leg) , the interaction between the two groups of cells is called

• A) induction.
• B) coordinated differentiation.
• C) implantation.

---

Definitions:

Tephra

A pyroclastic material, regardless of size or origin, ejected during an explosive volcanic eruption; includes ash, pumice, and rock fragments.

Gas Flux

The rate of gas transfer from one phase or place to another, often measured in environmental and geological studies.

Explosive

Characterized by a sudden and forceful release of energy, often with the generation of high temperatures and the release of gases.

Nonexplosive

Characterizing volcanic eruptions or events that release magma, gas, and ash in a relatively gentle and steady manner.