If a closed circuit has a battery connected to a lamp, which is then connected back to the other end of the battery, then: a. there is no current flow. b. there is no resistance in the circuit. c. the lamp will not light. d. it is a series circuit. me guys, i'm struggling with this question.

chemical properties are the characteristic of matter which can only be observed by changing the chemical identity of a sample like flammability reactivity and toxicity.

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.