30) Deforestation . A) decreases carbon dioxide in the atmosphere B) prevents erosion C) causes population explosions D) has the greatest impacts in tropical areas and arid regions E) is not widespread in North America

D. Has the greatest impacts in tropical areas and arid region

Explanation:

Deforestation involves the cutting down of trees. This process affects any type of climate and region because trees are important and acts as shields, protects from erosion etc

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."