Answer:the first on is a convergent boundary and the second also looks like a convergent boundary
Explanation:
 
        
             
        
        
        
Answer:
characterized by presence or absence of antigens
the blood types are A, B, O, AB
Explanation:
There are two antigens and two antibodies that are mostly responsible for the ABO types.  The specific combination of these four components determines an individual's type in most cases. Erythrocytes and serum were related to the presence of antigens on these erythrocytes and antibodies in the serum. these antigens  are A and B, and depending upon which antigen the erythrocytes express, blood either belonged to blood group A or blood group B. A third blood group contained erythrocytes that reacted as if they lacked the properties of A and B, and this group was later called "O" blood group. The fourth blood group AB, was added to the ABO blood group system. These erythrocytes expressed both A and B antigens. 
Blood group   Antigen present on RBC    Antibodies in serum    Genotype(s)
       A                        antigen A                             anti-B                     AA or AO
       B                        antigen B                             anti-A                     BB or BO
       AB              both A and B antigen                 none                         AB
       O                           none                           anti-A and anti-B           OO
 
        
             
        
        
        
Answer:
Hector spent the last three months on a winter fishing boat in alaska. he was doing research on population levels of fish for conservation efforts. hector most likely works in. plant systems.
Explanation:
plz mark it the brainliest
 
        
                    
             
        
        
        
Answer:
The two chromosomes in a homologous pair are very similar to one another and have the same size and shape. Most importantly, they carry the same type of genetic information: that is, they have the same genes in the same locations. However, they don't necessarily have the same versions of genes.
Explanation:
Hope this helped, can i get a brainlest please? :)
 
        
             
        
        
        
The answer is microspore and megaspore. hope that helped