The data suggests that dark colored fur coats are more preferred in regions with dark rocks, such as the West, middle and East regions. Option C is the correct answer - Dark color is selected for mice from the West, mid and East populations.
The endocrine system is a network of glands located throughout the head and torso. Unlike the nervous system which is directly wired throughout the body, endocrine organs are separate entities linked to each other via the cardiovascular system.
What is the cardiovascular system explained?
For the body to get oxygen, blood must be pushed from the heart through the circulatory system to the lungs. Following that, the heart pumps oxygenated blood through the arteries to the rest of the body. Veins bring blood that is oxygen-deficient back to the heart, where it is circulated again.
Why is cardiovascular important?
The cardiovascular system feeds the body's cells and organs with oxygen, nutrients, hormones, and other essential compounds. The body must be capable of meeting the demands of stress, exercise, and activity. It helps control body temperature among other things.
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Without the Sun's heat and light, the Earth would be a lifeless ball of ice-coated rock. The Sun warms our seas, stirs our atmosphere, generates our weather patterns, and gives energy to the growing green plants that provide the food and oxygen for life on Earth.
Answer: The correct answer is option c.
Explanation:
Cardiac conduction system is formed by specialized cardiac muscle cells which enable the heart to contract in coordinated fashion.
The main component of this system are:
- Sinoatrial node
- Atrioventricular node
- Bundle of His
- Branched bundle
- Punkinje fibers
SA node consists of cells known as pacemaker cells. These cells spontaneously generate action potentials which lead to the contraction of atria.
These potentials are then passed to AV node which relay them to bundle of His. These bundles are branched into right and left bundle which ultimately transfer these potentials to Purkinje fibers.
The potentials from these fibers lead to the contraction of ventricles.
Answer:
Nitrogen
Explanation:
Nitrogen is the most abundant element in our atmosphere and 7th most abundant in the universe. It is vital in the formation of nitrogenous bases which are the key bonds that form nucleic acids such RNA and DNA.
