The three mechanisms which regulate the heart are endocrine, cardiovascular and Sinoatrial nodes.
The endocrine system consists of the glands and hormones of the human body. The cardiovascular system is the organ system which is responsible for the circulation of the blood around the body and the oxygenation of the body's tissues. The sinoatrial node (SA node) generates the electrical impulses and is considered the natural pacemaker of the heart.
Answer:
Nitrogen and Phosphorus
Explanation:
When the function of a whole ecosystem is limited because of a nutrient , which is present in limited amount, it is called as a limiting nutrient. The organisms uptake water and carbon directly from the environment as it is abundant in nature. The nutrients like nitrogen and phosphorous are present in limited amount and moreover they are not present in the form that can be directly taken up by the organism.
Thus, Nitrogen and Phosphorous are limiting nutrients.
Option C is the correct answer.
Epigenetic tags continue to accumulate in response to ongoing experience throughout the life span.
Epigenetic tags refers to the external modifications to DNA which can turn on and turn off the genes. Though these modifications do not change the DNA sequence but they affect how a cell reads the genes.
During succession, the limiting factor that may affect the sun-loving mosses when taller plants start to grow around them is that there will be a competition in the water available in the soil since there is a high chance that these taller plants could use the water up more. In addition, these mosses will not get the full benefit from the sun because the taller plants are blocking.
