Help! I'm a bit confused on the phylogenetic tree

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

La glucosa es el nutriente mas utilizado por las celulas en la respiracion celular en esta ocurre 4 fenomenos cuales son