8.11C Human Dependence on Ocean Systems Artificial reefs, such as old ships placed in the ocean by humans, affect the ecosystems of
the ocean. How can these artificial reefs change the ecosystem?
A. Artificial reefs provide less protection to small fish.
B. Artificial reefs provide a new habitat for organisms.
C. Artificial reefs provide more oxygen to organisms.
D. Artificial reefs provide additional locations to drill for
oil.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

answerleaving cheese out to get moldy;