The answer is D. Zygote. A zygote is formed by the fertilization of an egg by a sperm. A gamete is what we refer to an egg or sperm as. Fertilization is what we call when a sperm and an egg come together, but it is not the product of the two.
Recessive gene
Hope that helps:)
The biosphere is everything. the whole planet. so all of the above is right
The density would be 14.567 lb/cu ft