The rna world hypothesis proposes that when life first evolved, rna both stored genetic information and directed the synthesis of proteins. according to the hypothesis, dna evolved from rna, and then it replaced rna as the genetic storage molecule. several observations that support the rna world hypothesis are given below.
rna stores genetic information.
rna can replicate itself.
rna is structurally similar to dna.
rna synthesizes proteins.
in contrast to rna, dna is not able to directly synthesize proteins nor can it replicate itself. however, according to the hypothesis, dna was able to replace rna as the genetic storage molecule.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

i think the answer is gold im not entirely sure

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;