Ancient photosynthetic prokaryotes were very important in the history of life because theya. produced the oxygen in the atmosphere. b. are the oldest known archaea. c. were the first multicellular organisms. d. showed that life could evolve around deep-sea vents.

Option A.

Produced the oxygen in atmosphere

Explanation:

Photosynthetic prokaryotes have chlorophyll in their cytoplasm. The chlorophyll is join to protein to form chlorosome(light harvesting molecules) which in turn convert light energy to chemical energy and fixed carbon dioxide in the atmosphere by synthesizing light in sugar , thereby release oxygen to the atmosphere. The photosynthetic prokaryotes include cyanobacteria, algae e.t.c

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.