Answer:
Rocks.
Explanation:
Scientists study rocks from the Precambrian period because isn't really a significant fossil record from the Precambrian.
The ecosystem that he should consider is the <span>tropical rain forest ecosystem.
In that area, there are uncountable amounts of various plants and animals that have not all yet been discovered and who all live together to build the biome. This biome is indeed the most diverse one even at this point without the knowledge of all possible life forms.</span>
Jupiter has a greater mass, but Earth is more dense
Waste that has had contact with some blood or other body fluids (pt. napkins, barriers) is considered contaminated waste and is disposed of as general waste in most states.