Question

HELLPP

Answer 1

2. Heart muscle cells, heart muscle tissue, heart, circulatory system
- Cells are the most basic and simple life forms, so they come first.
- Tissue is a collection of cells, so it’s more complicated than a single cell, but not exceedingly complex; it comes next.
- A heart is a complicated organ that requires multiple parts to function.
- A full circulatory system is an immensely complex operation that requires multiple organs to function well, so it is the most complex.