What caused this sandbar to form? A. wind
B. gravity
C. waves
D. erosion

I'm asking this for one of my siblings please help!

The answer is D, erosion.

Explanation: Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. A similar process, weathering, breaks down or dissolves rock, but does not involve movement.

The diagram is not given in the question, so the diagram is attached below.

chloroplast, thylakoid  space

Explanation:

The photosynthesis process is categorized in two steps light-dependent reactions and light-independent reactions.

In light-dependent reaction, chlorophyll absorbs one photon and loses one electron. This initiates the flow of electrons down an electron transport chain and result into reduction of NADP to NADPH.

Along with this, it creates a proton gradient or concentration across the chloroplast membrane and into the thylakoid  space. The proton concentration or energy gradient is then used by ATP synthase for the synthesis of ATP and cellular respiration.

Hence, the correct answer is chloroplast and thylakoid  space