She should decrease the incline and intensity of her treadmill so that she can lower her heart rate in her target heart rate range.
I would say the answer is C. D isn't right because mammoths didn't exist when dinosaurs did. And cyanobacteria were the first living organisms on earth.
Answer:
antibodies
Explanation:
The first line of defense (or outside defense system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils