The answer is False
Hope this help :)
If CO2 was in very small amounts then it would be the limiting factor of photosynthesis, this means the process will take place at a much slower rate because it is lacking one of the raw materials it needs for the process to occur. To find the optimum light intensity you really need all other factors to be at optimum levels or in abundance.
I believe it is a solution, sorry if wrong
Preserves animal tracks are called trace.