A condition where pathogens are present and multiplying in the blood is called a condition - septicemia
Septicemia or sepsis is a blood infection or blood poisoning. This requires immediate medical diagnosis. Its symptoms include - fever, chills, difficulty in breathing, nausea and vomiting, low blood pressure, faster heart rate etc.
The best answer would be:
Unconditioned stimulus
In Pavlov's experiment on conditioning the food was the unconditioned stimulus that triggers a reflex or natural behavior. Think of it like something that makes you do something automatically.
For example, the food. When the dog smells food, it salivates. This is unconditioned because without teaching the dog, it automatically responds by salivating.
The answer is the fourth one: Decrease in the fertility of the soil. If you just do crop rotation (harvesting a crop then planting the same type on the same soil) for many years, the soil just loses fertility because of so many of the same plants just using and depleting the fertility from the soil, making the soil less nutritious for the crops.
El principal gas de efecto invernadero emitido por el ser humano es el dióxido de carbono y sus gráficos de emisión nos pueden indicar muy bien el comportamiento del ser humano en el consumo de la energía fósil y de su desarrollo industrial.