Answer:
D. Chemoautotrophs
Explanation:
Autotrophs in plain are organisms that synthesize their own food while hetrotrophs are organisms that do not synthesize their own food.
Chemotrophs (Chemoautotrophs and Chemohetrotrophs) are a group of organisms that obtain their energy through the oxidation of inorganic molecules, These organisms require carbon to survive and reproduce. 
Chemoautotrophs are able to produce inorganic molecules by the fixation of CO2 from their immediate environment. The energy required for this process is got from Nitrogen, Magnesium, Sulphur etc.
Chemohetrotrophs are a class of chemotrophs that are unable to synthesize their own food but rather ingest complex molecules like carbohydrates from the environment. 
Phototrophs are a group of organisms unlike chemotrophs that depend on the source of light or sunlight for synthesizing its food or organic molecules. 
Photoautotrophs are basically photosynthetic plants which are able to carry out photosynthesis ie the conversion of CO2 and H2O to give Glucose and Oxygen in the presence of sunlight. 
Photohetrotrophs are a class of organisms that do not synthesize their own food but rely on other organisms or already made organic molecules. 
 
        
             
        
        
        
Answer:
there is an association between the number of mitochondria in muscle cells and energy production
Explanation:
Mitochondria generate energy by generating adenosine triphosphate (ATP), which is referred to as the "molecular unit of currency" of the cell since this molecule provides energy for diverse cellular processes
 
        
             
        
        
        
Sporophyte embryo. 
Seed coat are one of the three parts of the seed of plants. The endosperm, embryo and seed coat. The number one function of seed coat is for protection against the environment. A seed need protection from water, heat,. This can all affect the chance of being a mature animal. This can also provide insuation during sub freezing temperatures. It also protects the endosperm which is the primary source of food of the developing embryo.
        
             
        
        
        
Answer:
Statements thar are true:
Some  organisms have phenotypes that make them better  increase chances of reproduction.
Natural selection continues to occur even today
Phenotypes found In the most successful members of a species become the most prevalent after  several generations.
Explanation:
It is not true that all organisms must compete for survival, sometimes the conditions are good and there is enough food or good climate conditions and that makes no need of competition an increase in the individuals of the species.
Animals undergo natural selection, this is a random natural phenomenon that can make plants and animals adapt better or worse to the enviromental conditions. This cause that the beneficiaries can adapt, survive and reproduce and became the most prevalent after generations. 
Mutations are not phenomen that occur because the living being needs it, but rather they are phenomenon that occur at random at any time and determine the possibility of survival.
A decrease in food availability will do the contrary, decrease the variation in a population because it makes that only those who manage to adapt to eat another food survive, for example.
 
        
                    
             
        
        
        
Answer:
I believe its structural components of DNA and RNA.