How do stem cells know what type of cells to differentiate into? A. The nucleus has instructions to turn some genes on and some genes off
B. Genes turn on and off randomly
C. Signals from chemicals in the organism or from the environment determine which genes will be turned on and off
D. The cell has unique DNA that determines what the cell will become.

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

protistas excret ethanol used in the manufacture of vinegar