A. Pacemaker cells located in the atria fire before the pacemaker cells in the ventricles. B. It takes time for hormones to diffuse from the atria to the ventricles to trigger contraction. C.The electrical signal generated in the right atrium is delayed at the AV node before passing to the ventricles. D.The ventricular muscle cells contract more slowly than the atrial muscle cells.
<span>The correct answer is D: all of the above. Pollution has many negative effects on both the human population and the environment. If the air and water is heavily polluted, it can contaminate the human population and cause illnesses and even death. It can also taint natural resources making them unusable</span>
A sedentary lifestyle means you don't move anywhere. Similar to coral or sponges.
Have you eaten anything else apart from that peanuts
Answer:
Yes and no
Explanation:
Some countries have a lot more influence than others, such as the US and Germany. First-world countries usually begin the changes as third-world countries will usually look at the first world countries and eventually follow the actions of the first world countries. In conclusion, yes some countries are looked up to for change.
