Gametes then unite in fertilization and form a diploid zygote.
Examples of gametes are ova and spermatozoa.
Ova and spermatozoa unite in fertilization and form a diploid zygote.
what are united in fertilization for form a diploid zygote?

(a) h2o
(b) Veins and arteries.
(c) produce offspring
(d) Most plants
(e) joined
(f) ova and spermatozoa
(g) glucose and fructose
(h) Organic compounds