Their outermost shell has the maximum number of electrons it can hold.
Elements only react with each other to gain electrons to complete their outermost shell. Since noble gases already have a complete outer shell, they're usually inactive.
Solubility is the definition
Your answers are:
1. diploid
2. two times
The pulmonary artery
The pulmonary artery carries deoxygenated blood to the lungs.
1. weathering reduces solid rocks to smaller and smaller particles and erosion is the removal and movement of rocks/debris. so u could say that weathering breaks rocks down and erosion takes it away
2. water, wind, gravity
3. vegetation reinforces soil through growing over the loose soil to prevent erosion
1. - loss of fertile land and increased sedimentation in rivers
2. deforestation, agriculture, human induced climate change