Explanation:
Primordial organisms did not require oxygen for respiration as is the case with most organisms case today. These organisms were and are still mainly anaerobic. They main form of cellular respiration is glycolysis that does not utilize oxygen. Since other organisms evolved from the primordial cells, it is deduced that the early atmosphere was not mainly composed of oxygen but mainly carbon dioxide.
In today’s aerobic cells oxygen is utilized in the Krebs cycle as a proton acceptor making cellular respiration even more efficient in the production of energy. Remember that, utlimately, organisms evolve to fit into their environment.
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Producers are green plants or photosynthetic organisms that are the basis for the other living parts of any ecosystem. Producers need to have access to light to produce food. Few producers will be found deep below a lakes surface simply because the deeper you travel under water the less light penetrates those deeper layers.
An activity recommended when working with free weights is to do like an overhead press ie with the barbell, lift it up to the waist, then thrust it into the air higher than the head and lower it in the same step by step fashion. With the dumbells, one can use a bench and lie back on it and do a pec dec fly bringing the dumbbells towards each other.
Things like hurricanes and tornados get worse, flooding occours more often, the climate gets slightly warmer, sea levels rise, and warmer summer tempuratures.
C. UUU codes for the amino acid phenylalanine
