Question

1. put in order using numbers from largest (1) to smallest (5)

heart organ
heart cell
circulatory system
heart tissue

Explanation:

In biological organization, organ - systems are the largest, followed by organs, then tissues, and cells are the smallest. The circulatory system is an organ - system. The heart is an organ. Heart tissue is made up of groups of cells, and heart cells are the basic unit.

Answer:

1. Circulatory System
2. Heart Organ
3. Heart Tissue
4. Heart Cell