Answer:
Answer is Sinoatrial node, SA.
Explanation:
The sinoatrial node, SA, is known to be a group of cells which are found at the top of the heart.
The electrical signal that is initiated by the sinoatrial node bring about or stimulates the atria and then the ventricle of the heart.
It should be noted that, the sinoatrial node are regarded as the pacemaker cells.
Answer: A
Explanation: There is no need to conduct and experiment if you already know the answer
Answer:
First, the last picture
second, the third picture
third, the second or first (the picture is blurr so i dunno)
then the last is, the fourth.
sorry if wrong.
They are much much smaller and much much cooler despite being much much closer to the sun.the gas giant's mass allows for constant movement and friction which warms up it's core.
Photosynthesis uses the energy of sunlight to convert<span> water and carbon dioxide (reactants) into high-energy sugars and oxygen (products). ... </span>During light-independent reactions<span>, ATP and </span>NADPH<span> from the </span>light-dependent reactions<span> are used to produce high-energy sugars that can be stored for a long time.</span>
