Answer:
The Answer is A
Explanation:
After looking at all the other options, A is the best option. Good luck on your test! :)
Hopefully I helped! :)
 
        
             
        
        
        
Variations can be genetic or environmental, the traits are passed from one generation to other generation of snail is from from both parents to offspring and through the environment.
The correct answer is C.
Explanation:
Genetic variation in an organism is passed to the offspring by its parents.
environmental variation is the the result of different environment with which individual adapt.
Natural selection is a process in which a suitable trait which is well adapted to the environment is passed on tho future generations.
Genetic variation is the change in DNA or gene of the individual trait. The tree snails having different pattern in their shells is due to the habitat they are living in. 
The snails which have well adapted to the environment are able to reproduce and pass on the traits to their progeny. The variation is due to the traits passed from parents through the environment also.
 
        
             
        
        
        
Started with the same two groups: Plants and Animals. ... This is called a binomial naming system and it has two parts. The first part of the species name identifies the genus to which the species belongs; the second part identifies the species within the genus.
        
             
        
        
        
Answer:
Ribose and Deoxyribose.
Explanation:
They are both important components of nucleotides, and are found in RNA and DNA.
Hope I helped!