It is important to look at birth and death rates while considering population size because they determine the population size
        
                    
             
        
        
        
Answer:
An embryo sac is said to form when the haploid megaspore nucleus divides. It possesses two haploid nuclei and six haploid cells which do not have cell walls. 
Explanation:
 
        
             
        
        
        
Pre-embryonic cleavages make use of the abundant cytoplasm of the conceptus as the cells rapidly divide without changing the total volume.
 
        
             
        
        
        
Answer:
Operations of heavy machinery should be avoided.
Vehicles should not be driven at the period of medication.
Intake of alcohol and alcoholic beverages should be avoided 2 hours before intake of the medication,or within 8hrs after drug administration.
All these are essential to avoid accident from possibly drowsiness.
Explanation: