Answer:
Astrocytes.
Explanation:
Astrocytes are the star shaped cells that are present in the brain and spinal cord. The exact constitution of astrocytes in the brain is not known and almost 20% to 40% astrocytes are present in brain.
The astrocytes acts as the blood brain barrier and involved in the process of brain scarring. Astrocytes also regulate ions concentration by propagating the calcium ion channels in response to the stimulus. Astrocytes also generate a response by the calcium dependent release of glutamate.
Thus, the correct answer is option (B).
Protozoa (unicellular eukarotic organisms) typically reproduces asexually, but sometimes it reproduces sexually, too.
When it reproduces sexually it typically reproduces by conjugation of two mature cells - which means that neither of the cells is "male" or "female"
Answer:
Chemical bonding
Explanation:
Outer most shell's electrons are called valence electrons and they are responsible for the formation of chemical bonds either ionic or covalent when atoms react with each other.
Outer most electrons hold immense importance in the type of chemical bonding an atom will go through in the formation of a molecule.
For example, sodium has only one electron in outermost shell so it is very hard for sodium to share electrons and become stable. Therefore, it never goes for covalent bonding but only goes for ionic bonding where it gives off one electron to another atom (say chlorine who has 7 electrons in outermost shell) and in this process sodium chloride is formed and both sodium and chlorine get stable electronic configuration.
Please see picture for better understanding. Therefore, we can say that Electrons in the outermost energy level are usually involved in chemical reactions which are called chemical bonding or formation of chemical bonds.
Hope it help!
Answer:Any mammals or animals suck as lizards humans birds fish
Explanation:This is because we mammals require organs in order for our body to function