How do the number of electrons in the second energy shell of an atom change going across period 2 in the periodic table? a. atoms in period 2 do not have a second energy shell, instead the first energy shell increases in electrons from left to right. b. the number of electrons increases by 1, from right to left. c. the number of electrons in the second energy shell is full, the number of electrons in the third energy shell increase by 1. d. the number of electrons increases by 1, from left to right.

Populations of blue-winged warblers, a type of bird, migrate south in the winter and return to canadian breeding grounds in the spring. as global temperatures have increased due to climate change, spring has started arriving in the warbler's breeding grounds earlier in the year, before the warblers return. warblers now arrive at their breeding grounds too late to select ideal nesting sites and to feed on important early-spring food sources how are populations of blue-winged warblers most likely to be affected by the earlier arrival of spring? o a. populations will go extinct since the warblers will stop migrating to breeding grounds. b. populations will be unaffected since most species can quickly adapt to effects of climate change. c. populations will increase since warmer temperatures are generally beneficial to survival, d. populations will decline since individuals will be less likely to successfully reproduce, reset next

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

Genetic orders can result when sister chromatids fail to separate properly during which phase is this problem most likely to occur