Answer:
The fetus gets it's nourishment through the umbilical cord that is connected to the mother's uterus 
 
        
             
        
        
        
Answer:
At the microscopic level of a visceral muscle cell are actin and myosin filaments. They slide past each other in an antiparallel manner to shorten the distances between their ends.  In a smooth muscle cell, the ends of chains of these functional units are attached to the cell membrane. They are several in a cell arranged in an elaborate framework. They contract together and deferentially to enable the muscle to contract as needed. 
 
        
             
        
        
        
I think it’s A B and C because other sloths are alive and so are trees.
        
                    
             
        
        
        
Answer:
a. they can fix carbon at the lower CO2 concentrations that develop when the stomata are closed
Explanation:
C4 plants are those that have the capacity to fix CO2 even when a tiny concentration of it is available. 
Desert condition is characterized by dryness and strong heat with both condition capable of creating water stress in plant as a result of evapotranspiration. In order to reduce evapotranspiration rate, desert plants (most C4 plants) close their stomata during the day.
<em>Stomata closure limit the diffusion of CO2 into desert plants and the small concentration of CO2 that results is utilized by a special enzyme in the plants.</em>
The correct option is a.
 
        
                    
             
        
        
        
The
changeable nature of models is considered a limitation because when the model alters,
the answers that were achieved from the model may also transform.<span> <span>What this
means is that outcomes that’s been extracted from changeable models can be true
at a certain moment, place or situation, but the conclusions may not be
objectively true.</span></span>