The 30 million years ago, because its the closest one to us. Wait is there a picture to it ?
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: adenylyl cyclase inositol triphosphate mainly known as IP3 causes the release of Calcium ions directly from the inracellular stores and causea contraction.
Explanation:
IP3, inositol phosphate is a second messenger a signaling molecule. It is made by hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2), a phospholipid that is located in the plasma membrane, by an enzyme phospholipase C.
IP3 binds to the calcium channels and opens Ca2+ channels that are embedded in the ER membrane, releasing Ca2+ into the cytosol. Calcium ions released may cause contraction and regulate the Ca2+ channels in the membranes.
Answer:
question 1 i believe is a super volcano
question 2 the answer is B
i dont know the last 2 sorry
Explanation:
Answer:
B. Sun -> Algae -> Shrimp -> Red drum
Explanation:
The only way for the Sun to transfer energy is through plants, which rely on sunlight for food.
D. is incorrect, because plants cannot consume other vegetation.
