How do photoautotrophs make energy?

Select one:
a. They convert carbon dioxide, water, and inorganic compounds into carbohydrates.
b. They convert carbon dioxide, water, and organic molecules to carbohydrates.
c. They convert carbon dioxide, sunlight, and organic molecules to carbohydrates.
d. They convert carbon dioxide, water, and sunlight into carbohydrates.

I believe the answer is "B". Please correct me.

The right answer is D

Explanation:

They use carbon dioxide, water and sunlight to make carbohydrates. And the oxygen is just a byproduct. No real organic molecules are needed before.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.