Speciation forms new species.
Directional selection favors one extreme of a phenotype, which leads to evolution and adaptive change of a species.
Disruptive selection selects against the average and leads to evolution and genetic variation of a species.
Stabilizing selection favors the average individual in a population, which does not lead to adaptive change or evolution, and reduces variation.
Answer:
A. The habitat that an organism lives in
D. All of the above
Good luck on the test ;)
Answer: Mg2+
Explanation: ATP(Adenosine triphosphate) is unstable in nature and also shows the property of being electronegative. It is seen that 
is the electronegative element and it is bonded with the Mg2+ being a positive divalent and thus achieve the stability and reducing the electrostatic repulsion.So, there is the combination between the negatively charged phosphate groups with the Mg2+. Therefore option (a) is the correct answer.
It's ATP or Adenosine Triphosphate
