Pick your answer from:
[1]. pollen
[2]. infertility
[3]. gametes
[4]. orchids
[5]. seeds
[6]. no physical contact
[7]. honeybees
[8]. isolation
Given those answer options, answer the question: Fact 1: Fertilization occurs when a sperm and an egg fuse. Fact 2: Sperm and eggs are cells known as gametes. Given the two facts above, what causes fertilization?
A:
[3].