The largest organ in the body is the
a. skin
b. heart
c. liver
d. skeleton

The correct answer is A. Skin

Explanation:

In biology and related fields, an organ refers to structures composed of tissues that have a similar or same function. This includes organs such as kidneys, heart, lungs, among others. In the case of skin, this is considered an organ because the cells and tissue that composed skin serve to same purposes that include protecting the body from pathogens, regulating temperature and collecting stimulus related to sensations.

Moreover, the skin is the largest organ in the body because this can be found along all the body acting as an outer covering, while other organs are limited to one location, for example, the heart is only found in the chest, while the skin is the outer covering of the inner structures and tissues.

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.