seven species of dolphins
Answer: Usually a human body cell contains 46 chromosomes. We get 23 chromosomes from dad and 23 chromosomes from mom for a total of 46.
Answer:
First, Petra sprays the discolored area with
Fluorescein
, which returns a glowing blue color. However, she knows that this chemical might also turn blue with other substances that contain iron. Subsequently, she uses
Phenolphthalein
, which turns pink, indicating the presence of hemoglobin.
Answer:
A theory can never become a law
Explanation:
The rest are wrong
Theories can change
Laws cannot
