Answer :
The answer is A, a sperm cell and an egg cell combine to form an embryo. Reproduction in living things, regardless of whether plant or creature, by and large, happens in cycles. All plants and creatures have life cycles. Some life cycles are more intricate than others, yet certain components have a tendency to be general and apply pretty much similarly to both plants and creatures.
The correct answer is A. i the process of fertilization, the male gamete (sperm), and the female gamete (ovum), fuse together and embryo is formed. Embryo develops into foetus, and a new organism is formed. Fertlisation can be internal or external (aquatic animals).