This question would be easier to answer if you attached a picture of the graph the question is referring to.
If we remove all Carbon Dioxide from the atmosphere then the tree's would be able to produce the oxygen we breath since the tree's breath what we breath out
Answer:- The right choice is A.
.
Solution:- Latent heat of fusion means the heat required to melt the solid at constant temperature means there is no change in temperature only the solid changes to liquid. So, it is a solid to liquid phase change.

where q is the heat required to convert solid to liquid, m is the mass and
is the latent heat of fusion.
From given info, 550 kJ that is 550000 J of heat is required to melt 14 kg of solid at 262K temperature. Let's rearrange the equation for latent heat of fusion and plug in the values in it.


= 
If we round this value to two sig figs and write in scientific notations then it becomes
.
So, the right choice is A.
.
Be and B: Be is 1s2 2s2 and B is 1s2 2s2 2p1
Be has full 2 orbitals and so does B but B only has 1 electron in p so it is really unstable and easy to react. So there is a dip in ionization energies. The other questions are similar to this so if you need, feel free to ask me
I believe the percent yield is 56% if going by the formula of mass of actual yield/theoretical yield x 100%/