They all develop gills, slits and tails 
        
             
        
        
        
Enzymes in your gastrointestinal tract digest your lunch. these chemical reactions are categorized as catabolism.
<h3>What is 
catabolism?</h3>
The series of metabolic processes known as catabolism reduces molecules into smaller pieces that are then either oxidized to produce energy or utilised in other anabolic processes. Large compounds are divided into smaller components through catabolism.
<h3>What is a prime illustration of catabolism?</h3>
Catabolism happens as you are breaking down food. For instance, a piece of bread is broken down into simple components your body may absorb, such glucose, through this process (blood sugar).
<h3>What is difference between catabolism and anabolism?</h3>
The series of metabolic processes known as catabolism reduces molecules into smaller pieces that are then either oxidized to produce energy or utilised in other anabolic processes. The process of anabolism produces the molecules the body needs to function. Energy is released during the catabolism process. Energy is needed for anabolic processes.
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The digestion of the food in humans begins in the mouth. In the mouth, the salivary amylase enzyme digests and breaks down a small amount of the starch present in the food. The digestion process begins right in the mouth. and continues till the intestine. The carbohydrates (starch) are the ones whose digestion starts in the mouth.
Hence, the blanks can be filled with 'mouth and amylase' respectively.
 
        
             
        
        
        
Answer:
oligodendrocytes
Explanation:
Glial cells are part of the nervous system. These are helper cells that support the function of the central nervous system (CNS) and can be called oligodendrocytes when they supply myelin to neurons.  These cells are responsible for producing the myelin sheath have the function of electrical insulator for CNS neurons. They have extensions that wrap around the axons, producing the myelin sheath.
It is estimated that there are 10 glia cells in the CNS for each neuron, but because of their small size, they occupy half the volume of nervous tissue. They differ in form and function and they are: oligodendrocytes, astrocytes, Schwann cells, ependymal cells, and microglia.
 
        
             
        
        
        
<span>Additional facts:
A test cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring. 
Answer:
You'd use it when you wish to see if the one that you think is a homozygous dominant is a purebred, because if you did get a recessive offspring then it proves that the animal is a heterozygous and not a purebred.</span>