A hypothesis should be tested by changing one variable in an experiment.
<span>I think you have repeated the same question
The intrinsic conduction system determines the basic rhythm of the beating heart. It consists of autorhythmic cardiac cells that initiate and distribute impulses (action potentials) throughout the heart which causes the heart to contract and expand which causes the beating or pumping of heart</span>
Answer:
2 and 3
Explanation:
read it and see which will make sence
A) spines have to do with protecting from predators. B) water storage is incorrect. D) Bitter taste has to do protecting from predators
Thus, making C), growth patterns the correct answer. Plants grow around the fires. I also took the test and that is the correct answer
