At some point in their life cycle, all chordates have a postanal tail, __Notochord ____, hollow nerve cord, and ___Pharyngeal slits___.
<h3>Chordates </h3>
Chordates are animals belonging to the phylum chordata they include vertebrates, lancelets and tunicates of which vertebrates are the most common. As they develop throughout their life time they posses certain characteristics at some point and they are; 
- Postanal tail
- Notochord
- hollow nerve cord
- Pharyngeal slits 
Hence we can conclude that At some point in their life cycle, all chordates have a postanal tail, __Notochord ____, hollow nerve cord, and ___Pharyngeal slits___.
Learn more about Chordates : brainly.com/question/1674644
 
        
             
        
        
        
Answer:
yes, we have summer school
 
        
                    
             
        
        
        
A cell which contains cytoplasm, cell membrane and a nucleus
        
                    
             
        
        
        
Carolus Linnaeus.
Hope this helps!
        
             
        
        
        
Answer:
The hemocytoblast  (option B) are the parent cell for all formed elements of blood
Explanation:
All blood cells are originated from a common stem cell, which is called a pluripotent stem cell. It is capable of giving rise to any of the blood cells maintaining its existence through mitosis. By dividing pluripotent stem cells, new cells are originated, which become multipotent and differentiate into lymphoid (NK cell and the polymorphonuclear cell) or myeloid cells (megakaryocite); always respecting the original quantity.