As successive generations of an embryo's cells form by division, small differences in their immediate environments cause them to develop slightly differently, by activating or inactivating different parts of the DNA information.
Learning Goal 2
The availability of artificial means to prevent or facilitate pregnancy raises social, moral, ethical, and legal issues.
Learning Goal 3
The complexity of the human brain allows humans to create technological, literary, and artistic works on a vast scale, and to develop a scientific understanding of the world.
Learning Goal 4
The development and use of technologies to sustain, prolong, or terminate life raise social, moral, ethical, and legal issues.
Learning Goal 5
Both genes and environmental factors influence the rate and extent of development.
Learning Goal 6
Following fertilization, cell division produces a small cluster of cells that embeds itself in the wall of the uterus. As the embryo develops, it receives nourishment and eliminates wastes by the transfer of substances between its blood and the blood of its mother.
Learning Goal 7
Patterns of human development are similar to those of other vertebrates.