Can you please define you question?
        
             
        
        
        
skeletal system create blood cells
 
        
                    
             
        
        
        
Answer:
Phylum Rhodophyta and phylum Ochrophyta.
Explanation:
Phylum Rhodophyta and phylum Ochrophyta are the phylum that contains the largest multicellular forms of algae.  Algae belongs to phylum Rhodophyta also called red algae are used for commercial production of food and gels while on the other hand, algae of phylum Ochrophyta also known as brown algae are used to produce alginates, which are used as food additives in different products and as a thickening material.
 
        
             
        
        
        
Answer:
2.25%.
Explanation:
The recombination progeny occur due to the crossing over of the homologous chromosomes. The linked gene is 30 map units apart and the recombination frequency is 30.
If a plant of Ab/aB is selfed then the progeny obtained is as follows: Ab – parental – 35%, aB – parental – 35%, AB – recombinant – 15%  and ab – recombinant – 15%. The cross between the F2 progeny with aabb is ( 0.15 × 0.15) = 0.0225 or 2.25%.
Thus, the answer is option (A).