Answer:
Mitochondria are visible under the light microscope although little detail can be seen. Transmission electron microscopy (left) shows the complex internal membrane structure of mitochondria, and electron tomography (right) gives a three-dimensional view.
Explanation:
 
        
             
        
        
        
C6H12O6+6O2--->6CO2+6H2O+energy
Oxygen(O2) is used to break down glucose(C6H12O6) into energy so the answer is b
 
        
             
        
        
        
 The inner layer, the dermis, consists of a superficial papillary region of loose, areolar connective tissue, connective tissue and a thicker and deeper reticular region of dense irregular connective tissue connective tissue.
<h3>The layers of the skin</h3>
The skin is the largest peripheral organ that covers the outer layers of the body. It is made up of two layers namely: 
- Epidermis: The epidermis is the outer layer and it is made up of stratified squamous epithelium.
- Dermis: The dermis is the inner layer of skin. it is made up of superficial and deep layers.
The superficial layer is made up of papillary region of loose areolar connective tissue which helps to attach epithelial tissue to other underlying tissues.
While the deep layer is made up of dense irregular connective tissue which provides strength, making the skin resistant to tearing by stretching forces from different directions. 
Learn more about the skin here:
brainly.com/question/306377
 
        
             
        
        
        
I would say the growth, the repair, and the reproduction.
        
                    
             
        
        
        
Answer: SKELETAL MUSCLE
Explanation:
Skeletal muscles is a type of muscle tissue that forms those muscles that move the bones of the skeleton,straited because straitations (strips) can be seen on microscopic examination and involuntary as it is under conscious control.
Although most skeletal muscles move bones,they also accomodate a degree of voluntary control in breathing.
A lot of movements can be finely coordinated.example; writing but may also be controlled subconsciously, maintaining an upright position does not normally require thoughts unless a new locomotor skill is being learned example skating or cycling and the diaphram maintains breathing while asleep.
The fibre (cells) of the skeletal muscle are cylindrical,contain several nuclei and can be up to 35cm long.
Skeletal muscle contraction is stimulated by motor nerve impulses originating in the brain or spinal cord and ending in the neuromuscular junction.
The contraction of a whole skeletal muscle occurs because of coordinated contraction of it's individual fibres.