The Cambrian Explosion is when diverse animals were first recorded as fossils.
Chromosomes! They contain the recipe for making a living thing. They are found in almost every cell's nucleus and are made from strands of deoxyribonucleic adic (DNA)
B looks like the best to me
B. Soil Contamination
All the other answers are talking about clean and pure things while this answer is the only negative one. So B is your answer.
Answer:
Fruting bodies
Explanation:
Fungi can produce spores on somatic hyphae or on special spore producing hyphae which are arranged into structers called fruting bodies.