Answer: Local chemical conditions
Explanation: A Precapillary Sphincter is a smooth muscle that is located in circles around the capillaries.
The precapillary sphincter helps to coordinate blood flow to the into the capillaries by causing the capillaries to decrease the flow of blood to tissues that are dormant or not active.
The answer is calcaneus (heel bone) :)
Exposure to ionizing radiation, exposure to chemicals, or infection by viruses. A mutation is a change in a DNA sequence and can occur during cell devision.
Answer:
c the sedimentry rock have remains of plant and animals.