Answer:
a. vitamin d and vitamin b12
Explanation:
Vitamins are groups of organic compounds that are essential in small quantities for healthy human growth, metabolism, development, and body function. Vitamins are found in plants and animal foods or sometimes produced synthetically. Deficiencies of specific vitamins produce specific disorders. Vitamin d and vitamin b12 are important vitamins that the body needs. The body produces vitamin D when the skin is exposed to sunlight and it is very essential for strong bones, while vitamin b12 is naturally present in meats. Deficiency of vitamin d in the body can result in bone problems (including teeth) and it has also been linked to depression. Vitamin b12 deficiency can also affect mental functions by causing disorientation, memory loss, depression and confusion.  
From the question, the elderly woman may be developing a deficiency of vitamin d and vitamin b12.
 
        
             
        
        
        
Answer:
A good experiment must include all possible causal factors in one experimental group.
Explanation:
i cant tell if thats a choice but if not then none of the above i guess
 
        
             
        
        
        
8 of them are essential and human bodys can't produce them.they should be got from foods
        
             
        
        
        
The right option is; D) mitosis
In multicellular organisms, life begins as a single cell until mitosis occurs, causing growth.
Mitosis is a process of cell division, and a part of the cell cycle in which a single cell divides, and produces two identical daughter cells (new nuclei) that contains the same shares of the parent’s cell part. Mitosis occurs in multi cellular organisms, and its primary purpose is for growth, and to replace worn out cells. Mitosis contains four basic stages which are; prophase, metaphase, anaphase, and telophase.  
 
        
                    
             
        
        
        
Hello! <span>It would increase the level of carbon dioxide since less photosynthesis would be taking place.</span>