Which cellular structure regulates the movement of substances in and out of plant and animal cells? A Cytoplasm
B. cell wall
C. cell membrane D. nucleus

Based on its chemical properties, identify the position of each chemical family on the periodic table.

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.

The ammonia molecule in the diagram has the observed bond orientation because