Which is a correct statement about Aristotle's and Ptolemy's models of the solar system? A) Ptolemy's model was never useful because it was incorrect.
B) Aristotle's model involved epicycles moving within crystalline spheres.
C) Ptolemy's model involved epicycles moving along perfect circles.
D) Aristotle's model put the Sun at the center.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

the answers are as following:

1. c. double helix, nucleosome, coil, supercoil, chromosome

2. b. g2 phase, preparation for mitosis

3. d. interphase consists of the g1, s, and g2 phases

4. c. metaphase

5. a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set