Answer:
Pacemaker cells are located in the <u>sinoatrial node.</u>
Contractile cells are located in the <u>Heart</u>
Explanation:
One of the species dieing off.
Use less fossil fuels, drive cars less, (stop releasing their carbon gases), and recycle.
<span>1. Introduction of a different environmental pressure, like an invasive species or a prolonged natural disaster.
2. Random mutation, where a gene or set of genes in an individual organism is randomly different from the normal type of that gene in the larger population. This individual may gain an advantage from this mutation and its offspring will inherit the advantageous trait.</span>
