Answer:
water is a polar molecule
Explanation:
the electrons in a water molecule are not distributed evenly as oxygen is more electronegative than hydrogen and has a lone pair of electrons which are shared to form the H2O molecule, therefore 2 delta-positive and 1 delta-negative areas is formed.
Each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber Shortens
Mechanism :
Myofibrils are components of the animal skeletal muscles that are made up of sacromeres. They perform the muscular contraction and relaxation via the sliding filament model.
To produce motion, A cross-bridge forms between actin and the myosin heads triggering shortening of the sacromere. This shortening of the sacromere results in the contraction of the muscle fibers, which the net effect can be seen to be a shortening of the fibers.
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Answer:
D. Sunlight
Explanation:
Since photosynthesis provides the energy the plant needs for growth, lack of light will stunt the plant's growth.
Answer:
Its true
Explanation:
Breathing is taking in Oxygen and giving out Carbon dioxide, whereas Respiration is a process in which Food molecules are broken down in presence of oxygen to liberate the energy in the form of ATP.
Answer:
The mediastinum
Explanation:
The mediastinum is one of the three compartments of the thoracic cavity. It is found in between the right and left pleural cavities that contain the lungs. The mediastinum is like a midway in the thoracic cavity, and it is of great anatomical significance as it contains vital organs and structures such as the heart, aorta, esophagus, trachea etc. The mediastinum can be divided into two: inferior mediastinum and superior mediastinum.