Which came first? Plants or fish? On a timescale?

Question

Can someone tell me which came first?

Answer 1

Check the site below for an evolutionary timeline. It shows you quite clearly what appeared when. Algae & seaweed appeared about 1,000,000,000 years ago (Proterozoic). Fish around 500,000,000 years ago (early Paleozoic). First land plants around 450,000,000 years ago (also Paleozoic).

Hope this helps!

Answer 2

Experiments were performed by Stanley Miller starting in 1953, under simulated conditions resembling those then thought to have existed shortly after Earth first accreted from the primordial solar nebula. The experiments are called the "Miller experiments". The original experiment in 1953 was done by Miller as a graduate student and his professor Harold Urey. The experiment used a highly reduced mixture of gases (methane, ammonia and hydrogen). However, the composition of the prebiotic atmosphere of Earth is currently controversial. Other less reducing gases produce a lower yield and variety. It was once thought that appreciable amounts of molecular oxygen were present in the prebiotic atmosphere, which would have essentially prevented the formation of organic molecules; however, the current scientific consensus is that such was not the case.

The experiment showed that some of the basic organic monomers (such as amino acids) that form the polymeric building blocks of modern life can be formed spontaneously. Simple organic molecules are of course a long way from a fully functional self-replicating life form. But in an environment with no pre-existing life these molecules may have accumulated and provided a rich environment for chemical evolution ("soup theory"). On the other hand, the spontaneous formation of complex polymers from abiotically generated monomers under these conditions is not at all a straightforward process. Besides the necessary basic organic monomers, also compounds that would have prohibited the formation of polymers were formed in high concentration during the experiments.

Other sources of complex molecules have been postulated, including sources of extra-terrestrial stellar or interstellar origin. For example, from spectral analyses, organic molecules are known to be present in comets and meteorites. In 2004, a team detected traces of polycyclic aromatic hydrocarbons (PAH's) in a nebula, the most complex molecule, to that date, found in space. The use of PAH's has also been proposed as a precursor to the RNA world in the PAH world hypothesis.

It can be argued that the most crucial challenge unanswered by this theory is how the relatively simple organic building blocks polymerise and form more complex structures, interacting in consistent ways to form a protocell. For example, in an aqueous environment hydrolysis of oligomers/polymers into their constituent monomers would be favored over the condensation of individual monomers into polymers. Also, the Miller experiment produces many substances that would undergo cross-reactions with the amino acids or terminate the peptide chain.

Answer 3

well plants came 1st in relation to fish...they produced the oxygen and changed the composition of gases in the atmosphere. Fish would not have come first...how would they respire if there wasn't much oxygen dissolved in the water?

Answer 4

waterplants are the first.

Answer 5

none of those .. bacteria came first

Answer 6

Read your bible

Answer 7

GOD