Which factor would cause two specialized tissues that contain identical 4 points chromosomes to function differently?
(1) specific sections of DNA molecules in the chromosomes are activated. (2) All of the sections of DNA molecules in the chromosomes are activated (3) specific sections of the amino acid molecules in the cytoplasm are activated.
(4) All of amino acid molecules in the cytoplasm are activated

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Which nutrient tends to cycle within a single ecosystem?

Select the correct answer. which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. c. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated. d. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea.