Bear Paw Lake and Frog Lake were likely populated by the same sea-run population of stickleback at the end of the last ice age. Which of the following statements is the most reasonable explanation for what might have happened to the stickleback in each lake since colonization? Question 4 options:

Over many generations, stickleback in Bear Paw Lake have lost their pelvic spines, while those in Frog Lake have retained full pelvises.

Over many generations the pelvic structures in Bear Paw Lake stickleback have remained the same, and the stickleback in Frog Lake have gained their pelvic spines.

Stickleback in Frog Lake will lose their pelvic spines before the next ice age.

The ancestral marine population of stickleback must have lacked pelvic spines.

it should be briana that has it to me

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.