The diagram shows the process of cell differentiation. Which statement is true about the process shown?
A Cell 1 has a specific part of its DNA activated.
B Cell 2 undergoes a process to become a specialized cell.
C Cell 3 loses the ability to make a copy of itself.
D Cell 4 has the ability to modify into a stem cell.

Providing immunity by injecting the body with a weakened form a pathogen is known as

Which best describes an adaptation that could be found in a fish that lives in a slow-flowing stream? the ability to attract prey by glowingextra gills, for oxygen extractionthe ability to grow largerextra fat, for warmth

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.