Why is all of geologic time before the Cambrian Period sometimes collectively lumped together called the "Precambrian"?

A-We have very few fossils from the time
B-Nothing lived during that time
C-The time period was very short
D-Everything from that time was destroyed by volcanos.​

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.