The Cambrian period was important because it marked a dramatic burst of evolutionary changes in life on Earth. I<span>t is also the time when most of the major groups of animals first appeared in fossil records.</span>
        
             
        
        
        
Answer:
My best answer is domaint  hope this helps
Explanation:
 
        
                    
             
        
        
        
Answer:
Option A, hydrophilic/hydrophobic forces
Explanation:
The cytoplasmic membrane consists of phospholipids which have both the hydrophilic and hydrophobic regions and hence are amphipathic in nature. Due to this structural complexity, phospholipids produces barrier both at the interior and exterior of cell and hence form a membrane bilayer under suitable conditions. For instance when it is in water, it arrange itself in a way that their hydrophobic tails lie at the inner side and hydrophilic heads face outer side.  
Hence, option A is correct
 
        
             
        
        
        
These preparations are called Vaccines. A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing micro-organism and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins.
        
                    
             
        
        
        
Rajus classmates should be educated on the dangers of bull_ying and the benefits of being kind instead.
<h3>What is bull_ying?</h3>
Bull_ying is an action which is directed to another individual due to real or perceived power imbalance to cause the individual fear or h_arm.
The dangers of bull_ying include:
- causes feeling of worthlessness in the individuals being bulli_ed 
- can lead to self_h_arm such as sui cide 
- bull_ies can be prosecuted. 
By teasing Raju, her classmates are bull_ying her.
Therefore, Rajus classmates should be educated on the dangers of bull_ying and the benefits of being kind instead.
Learn more about bull_ying at: brainly.com/question/1460915
#SPJ1