{science question} -photosynthesis-
the taiga is a forest region in the northernmost part of the world. this region is very cold, and winters are long. most of the trees there are conifers, and many keep their green needles all year-round. why do you think the needles are important for the trees’ survival?

The trees in the taiga region don’t get much sunlight. So they have to maintain their green needles year-round so they can use photosynthesis to make enough energy.

"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."