If the law of conservation of energy applies to a situation, then: A. the system is an open one.
B. the total (PE + KE) before an event is equal to the total (PE + KE)
after the event.
C. matter is entering and leaving the system.
D. the output work being done is greater than the work being put into
the system

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.