The model of the solar system changed, because
a.
understanding of the solar system changed.
b.
the order of the planets changed.
c.
the first model of the solar system was not built to scale
d.
none of the above

If the coding part of an mrna molecule is 1800 nucleotides (bases) in length, this molecule will contain codons and code for a polypeptide that is amino acids long.

Evolution acts upon the population of organisms and not on each individual organism

Can happen anywhere along the spine if the neural tube does not close all the way. the backbone that protects the spinal cord does not form and close as it should. this often results in damage to the spinal cord and nerves. a) cleft palate b) spina bifida c) encephalocele d) down's syndrome