Maize is called monocotyledon plant why​

Because, it has only one cotyledon in their seed.

because it has  leaves with parallel veins

Explanation:

genetic variation will increase because of a new habitat and food source.

explanation:

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.