the drawing at the "fertilization" part is of an egg and sperm. each of them have a set of lines, so I'm pretty sure you're supposed to write words for each of them separately (23 chromosomes and haploid for both), then the next picture (zygote) is where you write "46 chromosomes" and "diploid."
after that the cell divides with the process of mitosis where both cells are diploid with 46 chromosomes