Light is used in photosystem II and photosystem I to Question 16 options:

A)

make carbon dioxide.

B)

excite an electron.

C)

fix carbon dioxide.

D)

power the Calvin cycle.

i need mutiple choices

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

thats a little if u want the answer just look it up on google thats what i do haha : )