Answer:
its ik bc i looked it up its number d
 
        
             
        
        
        
Plant cells have a rectangular shape and a cell wall, while animal cells have a circular shape and no cell wall
 
        
             
        
        
        
Answer:
A)Fixation. Nitrogen in its gaseous form (N2) can't be used by most living things
B) it can not be used because it most be converted or, ’fixed’  to a more useable form. To do this it goes through a process called fixation.fixation is the change in a gene pool from a situation where there exists at least two variants of a particular gene (allele) in a given population to a situation where only one of the alleles remains. 
C) This form can be made more usable if it’s converted. It has to go through the process of fixation so the gene pool changes. 
Explanation:
 
        
                    
             
        
        
        
Concepts in anatomy from the given options include:
- The brain is composed of two hemispheres.
- Each kidney contains approximately 6-10 pyramids.
- The muscle on the back of the arm has three heads of origin.
- Study of form.
<h3>What is anatomy?</h3>
Anatomy is a branch of biology that is concerned with the study of the structure of living organisms and their various parts.
Anatomy studies the position of body structures as well as the position of related structures or organs of the body.
Anatomy also studies how the structure of these body parts relates to their functions.
Therefore, concepts in anatomy from the given options are:
- The brain is composed of two hemispheres.
- Each kidney contains approximately 6-10 pyramids.
- The muscle on the back of the arm has three heads of origin.
- Study of form.
In conclusion, anatomy deals with structure of body parts of living organisms.
Learn more about anatomy at: brainly.com/question/896286
#SPJ1
 
        
             
        
        
        
The movement of food from the stomach into the esophagus is usually prevent by the sphincter