Scientists have found that all living things, from bacteria to humans, rely on genetic codes to direct the functions of their cells. These genetic codes are contained in strings of nucleotides and have very similar structures. Which hypothesis for the origin of life on Earth is supported by this evidence?

Self-replicating RNA in the early Earth's oceans served as the basis for the DNA in cells today.

Nucleotides and proteins that form the basis of life were originally carried to Earth from outer space by comets and meteorites.

Lightning striking water in an atmosphere rich in methane,

Question

Scientists have found that all living things, from bacteria to humans, rely on genetic codes to direct the functions of their cells. These genetic codes are contained in strings of nucleotides and have very similar structures. Which hypothesis for the origin of life on Earth is supported by this evidence?

Self-replicating RNA in the early Earth's oceans served as the basis for the DNA in cells today.

Nucleotides and proteins that form the basis of life were originally carried to Earth from outer space by comets and meteorites.

Lightning striking water in an atmosphere rich in methane,

anonymous · Answer

according to urey and miller expt ligtening condition along with the presence of water co2,ammonia resulted in formation of aminoacids,nucleotides,fattyacids and carbohydrates.
 fatty acid formation resulted in formation of micelle which might resulted in formation of primitive organisms.
evolution resulted in creating new species from existing ones.

initially RNA served as the genetic material. they are self regulation molecules(ribozymes acts as an enzyme) unlike proteins and DNA. there are many evidences available to prove that RNA originated first and DNA was obtained from RNA