Answer:
D.) both a and c
Explanation:
Past observations made early in history as well as telescopes and space probes are very important in studying our universe and galaxies. 
- Space probes are increasingly gaining momentum as technological and scientific advancements are being made. 
- Telescopes are used to see or picture objects that are very far away in space. 
- Also, understanding the past records and historical data is essential for the study of the universe. 
Microscopes are not used in galactic studies. They are only used to study the world of micro-organisms. 
 
        
             
        
        
        
Answer is : C, increase the surface to allow more space for ATP synthesis.
As it produces large amounts of ATP through oxidative metabolism of pyruvates, which are produced by glycolysis.
The main job of mitochondria is to perform cellular respiration.  This means it takes in nutrients from the cell, breaks it down, and turns it into energy.  This energy is then in turn used by the cell to carry out various functions.
Each cell contains a different number of mitochondria The number present is dependent upon how much energy the cell requires.  The more energy a cell needs the more mitochondria that will be present. Cells have the ability to produce more mitochondria as needed.  They also can combine mitochondria to make larger ones.
The most prominent roles of mitochondria are to produce the energy currency of the cell, ATP (i.e., phosphorylation of ADP),  through respiration, and to regulate cellular metabolism.The central set of reactions involved in ATP production are collectively known  as the citric acid cycle, or the Krebs cycle. However, the mitochondrion has many other functions in addition to the production of ATP.
 
        
                    
             
        
        
        
Explanation:
Make a standard, "dart" design paper airplane 
Fold your paper into the basic dart paper plane. Fold carefully and make your folds as sharp as possible, such as by running a thumbnail or a ruler along each fold to crease it. Do not bend up the edge of the wings
Throw the plane at least four more times. Each time before you throw the plane, make sure it is still in good condition (that the folds and points are still sharp). When you toss it, place your toe on the line and try to launch the plane with a similar amount of force, including gripping it at the same spot. 
Once you have a good idea of how far your plane typically flies, change the plane’s shape to increase how much drag it experiences. To do this, cut slits that are about one inch long right where either wing meets the middle ridge. Fold up the cut section on both wings so that each now has a one-inch-wide section at the end of the wing that is folded up, at about a 90-degree angle from the rest of the wing.
Make paper planes that are different sizes and compare how well they fly.
Try making paper planes out of different types of paper, such as printer paper, construction paper and newspaper. Use the same design for each. 
 Some people like to add paper clips to their paper planes to make them fly better. Try adding a paper clip (or multiple paper clips) to different parts of your paper plane (such as the front, back, middle or wings) and then flying it
I hope i helped
 
        
                    
             
        
        
        
 The answers are insulin?glucose. After a meal, the digestion of carbohydrates in the intestines release sugars , which are absorbed into the blood. If food contained high levels of simple sugars then blood sugars level rises quickly. Insulin is a hormone which is released by the pancrease in response to rising blood sugar levels. Insulin causes sugars to be stored in the liver in the form of glycogen and this in turn lowers your blood sugar level.