I believe you are asking about the "triangle" we were tought a simple triangle. Cells at the bottom because there are the most of them, tissues next, organ next, and organ system at the top. So I believe the answer you are looking for is Organ System.
Explanation:
developed countries like Canada, add a tax to its residents income for health care, but your choices for care are slim unless you can afford otherwise..
Answer:
D. Science
Explanation:
Because science is the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
false..........................................
The arteries (red) carry oxygen and nutrients away from your heart
