All of the following are possible sources of error in a scientific investigation except for a- not being able to complete all trials of an experiment
b- having a constant in your experiment
c- measuring material such as mass and volume incorrectly
d- recording experimental data incorrectly

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.