Is light energy changed to cell energy in stage 1 of photosynthesis

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

What is the similarities and differences between bacteria and eukaryote?

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?