Which best describes the structure of DNA? A. Nucleic acids arranged in a double helix

B. A retread with two sister chromatids

C. Chromosomes linked in a loop

D. Alleles held together by genes

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Cells destroy body cells infected by a virus or bacteria.

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement