Question

what evidence supports an increase in earth’s surface temperature?
a historical records
b tree rings
c ice cores
d corals
e all of the above.
question 45
why is there reluctance to eliminate fossil fuels as an energy source?
a there are no other sources of energy.
b they are relatively cheap to obtain.
c other methods of energy production are not as efficient.

Explanation:

For the first question: Historical records include direct temperature measurements over time; tree rings' width correlates with temperature (wider rings in warmer years); ice cores trap air bubbles and isotopes indicating past temperatures; corals' growth bands reflect sea surface temperature changes. All options provide evidence for temperature increase. For the second question: Option A is false (renewable energy exists); option C is not universally true (some renewables are efficient); option B is valid—fossil fuels are often cheaper to extract and use currently, causing reluctance to eliminate them.

Answer:

First question: E. All of the above.
Second question: B. They are relatively cheap to obtain.