Answer:
 Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I.
Explanation:
When chromatids "cross over," homologous chromosomes trade pieces of genetic material, resulting in novel combinations of alleles, though the same genes are still present. Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I.
 
        
             
        
        
        
2 times pro year and sometimes 3 times
        
                    
             
        
        
        
Helicase, DNA polymerase, Ligase and Primase. These are the ones we learned I don't know if there are more.
        
                    
             
        
        
        
Answer:
Darwin suggests that the strongest survive and adapt to produce even stronger more adaptable offspring
 
        
             
        
        
        
Answer:
c. bone (osseous tissue)
Explanation:
The extracellular matrix of the bone tissue consists of an organic component and an inorganic component.
The organic component includes Collagen , proteoglycans and glycoprotiens, While the inorganic component contains calcium and phopsphorus. The cells are present in the lacunae situated betwen the lamellae and contain a number of oblong spaces.
It also contains blood vessels as a typical long bons is supplied by a nutrient artery , periosteal vessels and epiphyseal arteries.
Hence C is the right answer.