The erythrocyte count increases after a while when an individual goes from a low to a high altitude because: the temperature is lower at higher altitudes. the basal metabolic rate is higher at high altitudes. the concentration of oxygen and/or total atmospheric pressure is higher at higher altitudes. the concentration of oxygen and/or total atmospheric pressure is lower at high altitudes.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

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.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).