Answer: 3.friction
Explanation: friction is a force of resistance acting between objects in contact and tending to dampen their motion
Answer:
Red blood cells (erythrocytes)
Red blood cells carry oxygen from your lungs to your tissues. They also bring carbon dioxide back to your lungs. Red blood cells make up almost half of your blood. The lifespan of a red blood cell is around 120 days
Explanation:
4 deletion
Explanation:
deletion is a type of genetic mutation involving the removal of a base pair
Primary succession starts with bare rock which is broken down by either lichen or moss to make soil while secondary succession starts with developed soil