Answer:
The number of years they serve per term.
The differences between physiological<span> and </span>psychological needs<span> are that </span>physiological needs<span> deal primarily with basic external </span>needs<span> for the care and maintenance of the human body. ... These </span>physiological needs<span> include simple basic </span>needs<span> such as nourishing food, clean water, shelter, and clean air.</span>
Answer:
Trench Weapons.
Grenades.
Underground Mining.
Artillery and Mortars.
Machine-Guns.
Poison Gas.
Rifles.
Tanks and Armoured Vehicles.
All sources will have some element of bias in them due to the fact that they are products of a specific person's (or specific people's) views. The best ways to deal with bias are 1) to acknowledge the bias and comment on it, 2) to include several sources with differing biases and discuss their differences, or 3) the analyze what the existence of the bias might indicate about the issue.