Answer:
The cell is the basic structural, functional, and biological unit of all known organisms. A cell is the smallest unit of life. Cells are often called the "building blocks of life".
Answer:
The system that removes waste in the blood from the body
Kidney
paired organs that clean the blood producing urine from waste
Excretory system
A group of different tissues that work Together perform a specific function
organ
A system specialized for bringing oxygen into an animal's body and removing carbon dioxide
respiratory system
The body system that recognizes and destroys pathogens and fights diseases
immune system
