Answer:
True
Explanation:
The sinoatrial node is a small body of specialized muscle tissue in the wall of the right atrium of the heart that acts as a pacemaker by producing a contractile signal at regular intervals.
Answer:
Hydrosphere-Biosphere
Explanation:
Hydrosphere is affected by this because the fertilizer is in the water . Biosphere is affected by this because due to the algal bloom, it suffocates aquatic life, therefore they are unable to survive.
Answer: B. High levels of nitrogen and phosphorus from agriculture runoff, sewage, and etc
Explanation:
i did it off study island