Which statement about the light-independent reactions in photosynthesis is true?
they occur in the thylakoids.
they produce atp and nadph.
they release oxygen as waste.
they comprise the calvin cycle.

The correct answer is They comprise the Calvin cycle.

Photosynthesis is a process by which green plants synthesize their own food from CO₂ and H₂O in the presence of sunlight. It is divided into light dependent and light independent phase.

Light dependent reactions occur in the thylakoids of chloroplast. In this, ATP and NADPH are produced ( using energy from sunlight and water) and Oxygen is released in the atmosphere.

Light dependent reactions occur in the stroma of the chloroplast. It is also called as Calvin cycle. During this, plants use ATP and CO₂ and produce sugar ( like glucose).

Thus, the statement which is true about light-independent reactions in photosynthesis is- They comprise the Calvin cycle.

the answer is d-They comprise the Calvin cycle.Explanation:

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.