The graph shows ice core data that illustrate historical trends in the amount
of carbon dioxide in earth's atmosphere. scientists attribute global warming
to recent increases in human activities that produce carbon dioxide. which
kind of data would show that a new solution to the problem of global
warming is working?
350
atmospheric carbon dioxide
from law dome ice cores
atmospheric co, (ppm)
$ 300-
290-
280
1000
1200
1400 1600
year (ad)
1800
2000

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

High-energy and unstable.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.