According to the endosymbiotic theory, the outer membrane of the chloroplast originated from which organelle? the lysosome of an engulfed prokaryotic cell
the chloroplast of a eukaryotic host cell
the cell membrane of a eukaryotic host cell
the chloroplast of an engulfed prokaryotic cell

i think it is dna, i'm not totally sure but i think it might be.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers