amino acids formed from chemicals. DNA is a molecule, and it is a molecule containing other smaller molecules. DNA ->Nucleotides -> Amino Acids -> Chemicals.
Perhaps not, but evolution can exist without natural selection.
It would be impossible for oxygen requiring organisms to exist before photosynthetic organisms because there was not oxygen in the atmosphere for these organisms to breathe. Photosynthetic organisms take carbon dioxide and water in and create oxygen as waste. Before these photosynthetic organisms existed there was not enough or any oxygen in the atmosphere for organisms requiring oxygen to survive.
This may not be the answer you're looking for exactly, but evolution doesn't exist. Maybe the organisms have changed slightly over time (natural selection) but they did not completely evolve. God created them as they are.
Because evolution does not exist and never did exist.
Like many organisms, insects need to survive its environment to further its survival and evolution. If not, then the species ceases to exist.
Yes, single-celled organisms can exist independently.
Breathable oxygen, or O2, did not exist in large quantities in the atmosphere until after the evolution of photosynthetic organisms. Hence, early organisms had to have an anaerobic metabolism, or one that did not require oxygen. However, compounds containing oxygen, such as water, have always been necessary to organisms.
According to the theory of evolution, yes, cavemen probably did exist.
Biological "de-evolution" does not exist. Evolution does not require an increment of complexity, as losing unnecessary adaptions is also evolution.
no because evolution doesn't exist
Likely, they were some sort of colony-organism, like Volvox today. Such organisms will exist as single cells for most of the time, but form colonies, aggregates of many thousands of cells, when under stress, for instance from predation or lack of food.
Obviously he was wrong. Organisms evolve, Evolution is not progressive, does not plan for the future and is not linear. The average tendency is for organisms to become more complex, but someone forgot to tell barnacles and tape worms, among others, as they have got less complex. Evolution is only change over time and Lamarck was wrong about ' improvements. '