Answer:
The seafloor is only 180 million years old due to the process of subduction. The floor of the sea's tends to get colder and denser with the passage of time. At a certain time, the seafloor becomes so dense that it sinks in the upper mantle. The Earth's crust cannot undergo this process and hence has oldest rocks. We can say that the seafloor is less than 180 million years old because it is typically recycled back into the mantle of the Earth.
The answers are a, igneous, and b, sedimentary. Hope this helped!
Answer:
d) A negative feedback loop
Explanation:
A negative feedback loop counteracts the deviation from homeostasis by generating a required response. The function of the insulin hormone is to lower down the blood glucose level when it raises above the normal range. Insulin triggers the uptake of glucose from the blood by cells. It specifically triggers muscle and liver cells to take up glucose from the blood.
Once the blood glucose level is restored to the normal value, the secretion of insulin stops. Here, a change in normal body condition (raised blood glucose level) was counteracted by the secretion of insulin hormone to restore the homeostasis of blood sugar levels.
Answer:
The correct answer would be D) cardiovascular system.
The cardiovascular system of the body consists of pumping organ that is, heart, blood vessels (arteries, veins, and capillaries), and transporting medium which is blood.
It is the main system which helps in transportation of oxygen, nutrients, and hormones throughout the body. In addition, it helps in the removal of metabolic wastes such as carbon dioxide and nitrogenous wastes.
