Answer:
Cells reproduce for repairing tissues and the growth and development of an organism. Cell division is necessary for any organism to grow and, once fully developed, to maintain healthy tissues. Mitosis occurs in a fully formed organism to repair damaged tissue and to replace old cells.
Answer:
The correct option is B
Explanation:
The number of valence electron(s) increases across the period and thus influences the direction of periodic trend of electronegativity, electron affinity and ionization energy across the period. Thus, making option B the answer.
It should be noted that option A is wrong because elements in the same period generally have the same number of electron shells and thus the distance of this shells from the nucleus remains the same throughout the same period and thus option C is also wrong. Option D is wrong because the periodic trends have to do with chemical reactions which actually involves electrons and not protons.
The answer we be C. which is karst topography.