Answer:
All cells are surrounded by a cell membrane. The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others.
Explanation:
 
        
             
        
        
        
Answer:Answer below
Explanation:
It's kinda hard to answer without the scenarios present.Wait nvm 
1.  the greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.The greenhouse effect occurs naturally. Lately the greenhouse effect has been magnified due to greenhouse gases emitted into the atmosphere by humans. and global warming is a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.Global warming refers to the increase in annual average temperatures across the globe. As the amount of greenhouse gases in the atmosphere increases, the planet becomes warmer and warmer on average.
2. atmospheric carbon dioxide acts as a thermostat in regulating the temperature of Earth
3. fossil fuels like coal oil and natural gasses
 
        
             
        
        
        
Because they are in different galaxies. I hope this helps! :)
        
             
        
        
        
Answer:
Tartar.
Explanation:
Dental plaque may be defined as the development of mass or biofilm of bacteria that grows on teeth surface. This plaque may present on teeth, between the teeth and on teeth front.
The plaque is first colorless but when it changes to dental calculus or tartar, the color of plaque becomes yellow or pale brown. This causes dental problem and different dental disease.
Thus, the answer is plaque.
 
        
             
        
        
        
Answer:
Gentle souls are often disguised by rough exterior
Explanation: