Marble is a. foliated, b. used for statues, c. easy to break into thin sheets, d. formed from siltstone or mudstone

Your answer is B. Marble is commonly used for statues. It is a metamorphic rock that is relatively soft and easy to work with fresh from the quarry. It hardens as it ages, making it ideal as a decorative piece. It can be polished and is shatter-resistant. It is also a favorite medium for sculpture because it comes in different shades. The most expensive type of marble though is one that is white. 

Other organisms can change their behavior to take the place of the plants in the ecosystem.