A(n)_____ Is a Layer of Fat Cells That Encases and Insulates

question 132

Multiple Choice

A(n) _____ is a layer of fat cells that encases and insulates many axons,and helps electrical signals travel faster down the axon.

• A)myelin sheath
• B)astrocyte
• C)dendrite
• D)nociceptor

---

Definitions:

Convergent Evolution

The process where organisms not closely related independently evolve similar traits as a result of having to adapt to similar environments.

Natural Selection

A fundamental mechanism of evolution where organisms better adapted to their environment tend to survive and produce more offspring.

Homologous Traits

Traits shared by two or more species that were inherited from a common ancestor.

Drug Resistance

The reduction in effectiveness of a medication such as an antimicrobial or an antineoplastic in curing a disease or condition.