What was the most important "cost"
of WW1? Why?

The most important cost of WW1 were human lives, as millions of people died during the war and later from many diseases.

Explanation:

WW1 was the most brutal war until then, which devastated European continent.

Although, material costs were enormous, human casualties were even greater.

Only nine millions who died in the war, millions who were wounded and deeply hurt, many families, even many countries devastated.

c.) biotic: snails; abiotic: temperature climate

well first we can compare on what the slave masters ate and what the slaves ate well the masters ate fancy great food like chicken rice mash potatose and stuff like that and slaves ate well food that your not suppost to eat like the weird parts of turkey and chicken and slaves master chilled beat and eat and slaves work get beat and get little of sleep there you go