<h3>What factor prevents us from finding fossils from the Precambrian era?</h3>
A. Life-forms in this era had no skeletons.
B. This was before life existed on Earth.
<h3><u>C. Life was destroyed by a series of mass extinctions.</u></h3>
D. There are no rocks left from that era.
<h2>#CarryOnLearning</h2><h2>#LearningIsFun</h2>
