The start from an are of high concentration to an area of low concentration until it's evenly spread out
Answer:
the organ system
the levels of organization go from
•cells
•tissues
•organs
•organ systems
•organisms
•population
•community
•ecosystem
•biome
•biosphere
Human<span> genus are called Homo they include the past genetic tree of humanity, with Neanderthals, Denisovans, and other extinct species of hominin. I hope this helps you!</span>
Explanation:
so there blood can go in and out of there arteries and ventricles
