A human cell with an unknown type has 23 chromosomes. Which of the following types of cells can the unknown be? Skin cell
Sperm cell
Cardiac cell
Intestinal cell

In the practice of science, this type of reasoning is used to develop explanations.

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

What is the one part of the nucleotide  that differs among the other different nucle  tides?