Joe the scientist wants to figure out the angle for throwing a football that will make it go the farthest, Joe borrows a football launching machine from
the local university football team and he buys a brand new, football. Joe
thinks that a football thrown at an angle of 600 will travel the farthest. Joe
sets up the machine, and launches the first football at an angle of 300. He
then repeats this for each of the following angles: 350, 400, 450, 500, 550,
600, and 650. Joe measures the distance from the launcher to the spot
where the football first hit the ground. What is Joe's hypothesis? *

answer: they produce more slow than unicellular organisms.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.  

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

explanation:

a