Occurs when a single sperm cell from the male penetrates the female's ovum.

conception

Explanation:

Conception is the process by which human fertilization and a baby is born.

This is done by natural means, as the sperm from the male merges with the egg (ovule) from the female partner.

The human development begins just at the very moment that the male and female cells (gametes) come together and join forming a zygote.

The human egg and sperm usually met in the ampullas of the fallopian tubes.

Since the cell has the DNA of both the male and the female , it will act based on this information to begin the development of the genetic features.

The conception paves the way for a 9-month long process that results in a human fetus that forms with increasing complexity in different forms of tissue.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.

i would say b. research typically uses a variety of sources