3. which sentence has an error in a plural noun?
o many things believed to be supernatural are actual natural phenomenons.
o do you have any baby teeth left?
not all bacteria are bad for your health; some can be beneficial.
o my friend judges the calves at the local 4h show every spring.

a low four-wheeled open carriage of a kind formerly used in russia.

there is a sequence and logical steps to give an answer of a trouble.

1) strategy is necessary to develop an project idea.

2) to study and know the environment where you are going to work ( ecosystem).

3)   the materials resources to built the ideas.

4) to give a priority order in the context that you study. in this case human needs.