Ascientific law is

a. a universally accepted conclusion based on testing
b. always changing as new evidence is presented.
c.based on new evolving community
d. one step toward forming theory

b.) always changing as new evidence is presented.

Step-by-step explanation:

Scientific laws or laws of science are statements that describe or predict a range of natural phenomena. A scientific law is a statement based on repeated experiments or observations that describe some aspect of the natural world. 

6 class periods

Step-by-step explanation: If she reads 1/12 of the book and 1/12 times 12 is equal to 1 then it will take 12 classes

hope this helps mark me brainliest if you can