The substance must be able to alter its physical characteristic (for example, its color) in accordance to a change in pH. One example of this is litmus paper, which becomes red under acidic conditions and blue under basic conditions.
 
        
             
        
        
        
Answer:
In intravenous ossification, bone develops directly from sheets of mesenchymal connective tissue. In endochondral ossification, bone develops by replacing hyaline cartilage. Activity in the epiphyseal plate enables bones to grow in length. Modeling allows bones to grow in diameter.
Explanation:
 
        
             
        
        
        
Answer:
Flowers produce seeds. Many flowers contain both male and female organs needed to produce new flowers. Flower petals are often colorful or have a scent to attract insects and other animals. The male organ of a flower that has an anther on a stalk (filament).
 
        
             
        
        
        
Answer:B. Primary consumer 
Explanation:The reason why Its b because that primary comsumers are mostly herbivores or the primary comsumer is the first consumer to eat the producer.Hope it helps!
 
        
             
        
        
        
Answer:
Biological magnification refers to a phenomenon where some of the substances like heavy metals or pesticides move up the food chain, make their way into the lakes or rivers, and are eventually consumed by aquatic species like fish. This, in turn, is further consumed by large species like large birds, humans or animals.  
This is associated with the health warnings given to pregnant women as too much eating of some kind of fish may influence the immune systems, that is, may affect the health of women who are pregnant.