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. Tissues are defined as groups of specialized cells working together as a unit.
For Question 4: Cytology is the study of cells, gross anatomy studies large visible structures, superficial anatomy focuses on external body features. Histology is the study of tissues, including components like collagen.

Answer:

1. Tissue
2. Histology