Igneous rock can to form metamorphic rock a)melt b)harden c)heat up d)weather

Heat & Pressure ( So I guess in this answer choices it's " Heat up" )

The reason it's not " melt " because if melting were to take place then that would make Magma, and magma isn't metamorphic rock.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.