Astudent can study a karyotype to learn about the
a - molecular structure of a chromosome.
b - genes that are present in a particular strand of dna
c - medical history of an individual.
d - chromosomes present in a somatic cell.
e - eye and hair color of an organisms

chromosomes present in a somatic cell

Explanation: karyotyping is the study of the number of chromosomes that are present in the cells of an organism. For checking genetic abnormalities karyotyping tests perform. In which chromosomes number is determined. Chromosome count checked and person gender can also be checked in forensic cases like by the male Y chromosome, male gender can be determined.

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.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.