Answer:
A physical change effects a substance physically. Examples include cutting, bending, dissolving, freezing, boiling, and melting.
A chemical change effects a substance chemically. Examples include burning, rusting, and digesting.
Hope this helps.
B, hormones that serve as chemical messengers im not 100% sure though
Answer:
"The ocean currents are too strong by the Amazon River to form deltas."
Explanation:
The ocean currents carry away sediment in the river before it can settle and form a delta.
