All of the listed human actions affect the nitrogen cycle with the exception of the a) use of agricultural fertilizers. b) runoff of pesticides into streams and lakes. c) production of sewage and animal wastes from farms. d) removal of soil bacteria from irrigation or construction.

The correct answer is option B) runoff of pesticides into streams and lakes.

Explanation:

The nitrogen cycle is the process in which atmospheric nitrogen is fixed to the soil naturally. Agriculture fertilizer is help in adding nitrogen to the soil directly that affect the nitrogen cycle positively.

The nitrogen cycle also affected by the waste and sewage farming as it produces the nitrogen by the process of decomposing. this is also affecting the nitrogen cycle positively. Removal of the bacteria from the soil by irrigation also affects the nitrogen cycle.

Thus, the correct answer is option B) Runoff of pesticides into streams and lakes.

not too sure but maybe in the hot springs.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.