ability of cells to communicate with adjacent cells within an organism
It could be a lump of coal.
Since you can break pieces off, maybe charcoal ... the real thing, not a "briquet".
Do your hands get all black when you handle it ?
I think it’s A for the first one and C for the second one
Be 1s²2s², [He]2s²
beryllium (2- second period, s² - 2A group)
