I agree. Although, i STRONGLY believe 2 is B since within the context of natural selection, it is about who can survive and dominate within a specific environment.For 2 I would say B because if they survive all the challenges, then they can go onto reproduce and pass on their favourable characteristics.
For 3, C and D are gone immediately. I would go B (same reason as above)
For 5 its D. Its not B because they didn't know chromosomes existed at the time so it couldn't have been part of his work.
For 6 its B. Its the only one that would survive in the low pH of the stomach.
The answer is C because to create energy, oxygen is required to produce ATP during respiration in which it is now available for the endotherm to use to stabilise its body temperature.Wow, that one's a lot tougher. I would rule out A and B, leaving C or D. I'm really not sure on this one so I would just go C.
These were my answers too.My answers are:
2) C
3) B
5) D
6) B
18) C