Question

a group of cells functioning together as a unit is called a(an):
chemical level of organization.
organ
organ system
tissue
question 4
which of these terms correctly describes the study of collagen, a type of tissue?
cytology
gross anatomy
histology
superficial anatomy

Explanation:

For the first question: The chemical level refers to atoms/molecules, an organ is made of multiple tissues, an organ system is a group of organs, while tissue is defined as a group of specialized cells working together as a unit.
For the second question: Cytology is the study of cells, gross anatomy studies large structures visible to the naked eye, superficial anatomy focuses on surface body features, and histology is the study of tissues (including collagen-containing connective tissue).

Answer:

1. Tissue
2. Histology