Which of the following Identifies the challenges faced by scientists experimenting with using artificial photosynthesis as energy sources for automobiles?
o the cost and size of materials needed to produce energy
the scarcity of materials needed to produce artificial leaves
the possibility of releasing significant amounts of greenhouse gases
o the problem of contributing to global warming

The cost and size of materials needed to produce energy

Explanation:

Artificial photosynthesis is a chemical process that uses solar cells instead of chlorophyll to absorb sunlight and convert it into electricity. This process uses artificial leaves that require man-made catalyst to spilt water present in the air into hydrogen and oxygen. It is clear that the reaction requires heat from the sun for energy production thus the technology is expensive to be applied in most areas of the world. Additionally, results obtained from previous undertaken projects of this type has been ineffective and unsustainable because it involves a lot of trial and error.

answer:

clock

explanation:

always running (on) sing each hour (chime) and the clock face (front)