Answer:
1. hydrogen; 2
2. it means two strands of DNA twisted around each other like a winding staircase
Mitosis allows cells to make copies of themselves
1. All living organisms are composed of one or more cells.
2. The cell is the basic unit of structure and organization in organisms.
3. Cells arise from pre-existing cells.
4. All cells maintain homeostatis.
Prokaryotes lack an organized nucleus and other membrane-bound organelles, the prokaryotic DNA is found in the central part of the cell called the nucleons, the cell size ranges from 0.1 to 5.0 in diameter, the cell wall of a prokaryote acts as an extra layer of protection, helps maintain cell shoe and prevents dehydration.
A) Villi are useful in providing more surface area!
