When the sun’s UV rays come in contact with CFCs, the chlorine atoms come loose. These chlorine atoms wander around the atmosphere until they meet up with ozone molecules. The chlorine atom and one of the oxygen atoms of ozone combine, leaving behind diatomic, or molecular, oxygen. When a free oxygen atom contacts this chlorine-oxygen compound, the two oxygen atoms combine to form molecular oxygen, and the chlorine goes off to devastate more ozone molecules. Molecular oxygen, unlike ozone molecules, cannot keep UV rays from reaching the Earth's surface. The U.S. Environmental Protection Agency estimates that one atom of chlorine can destroy as many as 100,000 molecules of ozone. In 1974, M. J. Molina and F. S. Rowland published a paper outlining how CFCs broke down ozone molecules in the atmosphere.
The correct sequence is -
B , E , A , C , D
Active transport is the movement of materials against a concentration difference; requires energy
Facilitated diffusion is when molecules pass across the membrane through the cell membrane channels.
So it would be Q4. Both involve proteins in the cell membrane
Answer:
yes
Explanation:
because Calcium is an essential mineral for the body, helps the body stay healthy, helps children achieve good height and stature when they grow up, and helps us avoid bone and joint diseases, especially when we are getting older
Answer: A diet rich in calcium and vitamin D supplements.
Some examples off calcium rich foods include Cheese; Yogurt; Sardines and Canned Salmon; Beans and Lentils; Almonds; Whey Protein; Some Leafy Green.