Answer:
In double-stranded DNA, the molecular double-helix shape is formed by two linear sugar-phosphate backbones that run opposite each other and twist together in a helical shape. The sugar-phosphate backbone is negatively charged and hydrophilic, which allows the DNA backbone to form bonds with water.
I believe the answer is a. crossing over
Yes there are cell organisms are divided into each of there own groups
Answer:
A salt water fish living in the Indian Ocean
Answer:
1. Vestigial organs.
2. Homologous structures.
3. Analogous structures.
