Please help me. The diagram below shows the structures of a plant cell.

What is structure 1, and how does it help sustain life?

A.
Structure 1 is the cell wall, which provides structural support for the cell.
B.
Structure 1 is a chloroplast, which is the site of photosynthesis.
C.
Structure 1 is a vacuole, which temporarily stores wastes.
D.
Structure 1 is the nucleus, which is the control center of the cell.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

Maya wrote if you step to describe how carbon circulates between the atmosphere and living organisms