Many organisms spend most of their life cycle in the diploid state. if meiosis produces haploid cells, how is the diploid number restored for those organisms that spend most of their life cycle in the diploid state?
a) dna replication
b) reverse transcription
c) synapsis
d) fertilization

D

Explanation:

During fertilization, one gamete from one parent meets and fuses with a gamete from another parent, to form a zygote. The zygote then develops into a mature organism through embryology. Fertilization (a form of genetic recombination) is an evolutionary advantage that ensures that a population maintains genetic diversity which is important for the population  so it is able adapt to changes in the environment.