Which of the following replaces guanine in rna?
(a) adenine
(b) thymine
(c) cytosine
(d) uracil
(e) none of the above

Johannesburg kepler, an apprentice of brahe, believed in the heliocentric universe but rejected past astronomers belief in

What molecules does hemoglobin decay into over time

Which of the following words best matches this definition: the process in which the best adapted organisms survive and pass on their traits, while those that are not well adapted do not survive to pass on their traits. question 3 options: acquired selection natural selection artificial selection organic selection