Answer:
depletion of the ozone layer
Explanation:
<em>The environmental concern caused by chlorofluorocarbon is the destruction to the ozone layer.</em>
The ozone layer is a layer of the stratosphere that absorbs some of the harmful radiation that otherwise would have the reached the earth, causing health issues to living organisms. Specifically, the ozone acts as a shield that prevents harmful UV rays from getting to the earth.
<u>When chlorofluorocarbon is attacked by UV ray, it leads to the production of chlorine atom at the stratospheric layer of the earth. The free chlorine atom is capable of reacting with one of the oxygen atoms in ozone, destroying it and leaving only oxygen molecule.</u>
At the end of the day, a single chlorine atom is capable of destroying thousands of ozone molecules, gradually removing the shield that serves as protection to the living organisms on earth.
Answer:
not sure exactly what you're asking, but marine fish are evolved to live in salt water, and therefore cannot breathe properly in freshwater
Answer:
b. a capsule
Explanation:
The capsule is mainly made up of polysaccharides and surrounds many bacteria. Capsule staining includes mixing of the bacterial cells with dye and spread out in a thin film on a slide. After air-drying, the cells appear as light-colored structures present in a relatively dark blue-black background. This occurs since the dye particles cannot penetrate either the cell or its capsule. Therefore, the given slide with a colorless ring around the cells in a dark background represents the presence of a capsule around the observed cells.
This might help! Hope it does here you go
Answer: The correct answer is B. active transport by endocytosis.
Polysaccharides and protein molecules are quite large that cannot move into a cell by diffusion so they move by endocytosis through the active transport. The mechanism of active transport requires energy in the form of ATP molecules. The substances that move across the cell membrane against the concentration gradient use the energy of the cell and move through the membrane.
Endocytosis is also a form of active transport which moves large molecules like whole cells or parts of cells, proteins etc. into the cell. The plasma membrane forms a pocket around the target cell to be engulfed and then the pocket pinches off and the particle is contained in a new vacuole formed by the plasma membrane within the cell.