Answer:
Nicholas Steno
Explanation:
Nicholas Steno who was a Catholic priest establish relationship between sedimentary rock layers otherwise called stratigraphy.
Stratigraphy is a branch of geology that deals with the study of rock layers. He established theoretical law of stratigraphy by introducing law of superimposition, principle of original horizontality and the principle of lateral continuity in 1669 work of fossilization of organic matter sediments.
 
        
             
        
        
        
George Mendel chose to use purebred plants in his experiments because they have a variety of traits.
        
             
        
        
        
Answer:
18. Which four body systems interact to allow a person to sneeze: 
F. Muscular, immune, nervous, respiratory. 
Don't really know the answer for the second one, sorry <33
 
        
             
        
        
        
The correct answer is letter A. Venom glands and varied diets are the reasons why cane toads are considered as invasive species in Australia. They cause major ecological imbalance within their immediate surroundings and have caused an infestation all over Australia.