Answer:
O H20 and CH4, but not O2
Explanation:
Compounds consist of multiple elements. O2 is just two oxygen atoms, meaning two atoms from the same element.
 
        
             
        
        
        
The correct option is A.
When an end of a tuning fork that is vibrating is placed against a table, it produces a sounder that is dramatically louder than the original sound produced by the vibrating tuning fork. At this stage, the tuning fork is forcing the table to vibrate at its own frequency. Thus, the statement in option A is not true. 
        
                    
             
        
        
        
Answer:
white blood sells
Explanation:
they in ur blood and helps fights off diseases and heal cuts
 
        
             
        
        
        
Answer:
you would see rivers and mountains.
pine peak is the highest point because there are more circles surrounding it and its also named.
it is flowing away from the ocean because fresh water fish have to swim UP river to spawn in the ocean.
i think its 20 but im not sure 
Explanation:
i hope this helps :)
 
        
             
        
        
        
Answer:
The endocrine system is a chemical messaging network. Endocrine glands secrete hormones, which are carried by the circulatory system throughout the body. The primary endocrine glands are the pituitary, hypothalamus, pineal gland, thyroid, parathyroid, adrenal, pancreas, ovary, and testis. Hormones maintain homeostasis in the body.
Explanation:
Hope this helps!