During transcription from dna to rna, which base occurs only in rna
a. uracilb. thyminec. adenined. cytocine
the center of the dna molecule, the rungs of the ladder, are composed of

The images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that . the archaeopteryx and bird have wings, while dinosaurs have limbs. so, it can be concluded that .

What is a codon and where is it found

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .