18. Which term means a group of similar cells combined to perform a common function?
Answer: A
Tissue
A tissue is defined as a group of similar cells that work together to perform a specific function in an organism. This concept is fundamental in biology as it highlights the organization of cells into functional units.
A) Tissue
This option is correct because it directly refers to the definition of tissue in biological terms. Tissues consist of groups of cells that share a common structure and function, working collaboratively to carry out particular tasks essential for the organism's health and operation.
B) Organism
An organism refers to a living entity that can function independently. While it is made up of multiple tissues, it is not a term that describes a group of similar cells specifically focused on a common function.
C) System
A system in biological terms usually refers to a group of organs that work together to perform complex functions. This term encompasses a wider array of structures than just a collection of similar cells, making it incorrect in this context.
D) Organ
An organ is a structure composed of different types of tissues that work together to perform specific functions. While organs are formed from tissues, they do not represent a group of similar cells, thus making this option incorrect.
Conclusion
The term "tissue" is definitively the correct answer as it accurately identifies a group of similar cells performing a common function. In contrast, the other options refer to broader or different biological concepts that do not specifically address the grouping of similar cells. Understanding tissues is crucial for studying higher levels of biological organization.