Answer:
not significant to the overall mass of the atom
Explanation:
The mass number of an atom is the combination of the mass of the protons and neutrons. Electrons are not included because their mass are so insignificant that is doesn't change the total mass much, therefore they are left out. The mass of an electron is about 1,830 times smaller than protons and neutrons.
That is true, species can breed within
Answer:Morphology and Physiology
Explanation:Morphology studies the form,structure and features of an organism this could include the shape,height,color etc while physiology help study the underlaying factor that gives rise to the ways its functions.
This two are key for a Biology to group an organism for when the morphology is know it is possible to classify such organism.
The retina and optic nerve are part of the central nervous system, as they are derived from the neural tube. We know that oligodendroglia provide myelin for the central nervous system and Schwann cells provide myelin for the peripheral nervous system. Therefore, oliogodendroglial cells must provide the myelin for the optic nerve.
