Your answer is C. Abrasion. Abrasion is a mechanical weathering, which uses physical forces to break down rocks without changing the chemical composition. The other answers are examples of chemical weathering.
Molecule, organelle, cell, tissue, organ, organ system, organism, community, population, ecosystem, biosphere
C. spinal nerves
it is the answer to your question.
B. confirmed that learning causes neurological changes in the brain
Answer:
A subscript is used only when more than one atom of a given type is present.
Explanation:
Molecular formulas are written with an index in the lower right corner. The index indicates the total number of atoms of one chemical element that is part of a molecule.
In the molecular formula of a compound, the coefficients can be different and that means that we have a different number of molecules of the same compound, but the indices cannot be different, because then it is no longer the same compound.