Answer:
The primary function of the plasma membrane is to protect the cell from its surroundings
Tin, because it has five energy levels with four electrons in the fifth level
.
Explanation:
Tin has an electronic configuration as
1s2,2s2,2p6,3s2,...........4d10, 5s2,5p2
They have four valence electrons in their outer shell
Among the four diagrams given Tin is least reactive because the atomic radius of tin is largest among all four options. Due to large atomic radius electronegativity decreases and hence Tin is the least reactive element among Neon, Chlorine, gallium and tin.
The electronegativity of an element is its tendency to complete its octet by attracting electrons towards itself. Also tin is at the lowest place in the periodic table among all the four mentioned elements, its ionization energy is also low hence less electronegative and least reactive.
A city has flooded leaving many people without houses or cars. People are having to walk to go out to places.
Answer:
The correct option is c ( <span>sexual reproduction joins two cells that each have half the total chromosome number).
Reason:
Meiosis occurs only in reproductive cell in which the number of chromosome reduce to half. This phenomenon is very imoportant and essential for maintaining the number of chromosomes in species.</span><span />