Comparing the simulated model and actual cell division under a microscope can improve understanding because actual observations

the supermassive black hole is in the middle of the galaxy.

answer: dna

because all cells have genes

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101

prothallium

explanation: