How multicellular organisms meet their needs

Multicellular organisms e.g. man  meet their needs through use of specialized  systems that they have in their bodies. Examples of such include:

1. cardiovascular system composed of heart, veins and  arteries which facilitate transport of nutrients to all parts of the body .

2. Skeletal system composed of bones, joints, ligaments and cartilage whose function is support and protection of the body. 

3. Digestive system composed of mouth, esophagus, stomach , small and large intestines whose function is breakdown of food and absorption of nutrients.

im pretty sure its none of them

all 4 come together due to gravity

all objects have gravity, even atoms

but their gravitational force is very low and it takes a long time for them to become closer together