The inability of either side to make significant advances in belgium and france led to question 7 options:
a. the use of tanks and machines guns
b. the construction of airfields
c. the construction and use of trenches
d. a decrease in the use of poison gas

Both sides constructed and used trenches.

Explanation:

for k12 users

judaism, christianity and islam, are all abrahamic religions and therefore have in common the hebrew idea of a single god which is the source of all morality. the idea of the covenant is only related to judaism, while dharma is a concept of indian religions and the four noble truths are basic principles of buddhism.

hello,

the steamboat is your answer.

it seems like its the only form of transportation on the choices.