The barnacles are only able to attach them selfs to surfaces in the water. Since the surface is limited, barnacles are attaching themselves to the other barnacles, crowding the rock. The muscles were not able to grow or attach themselves off the surface of the rock. Same thing with the mussels that are growing on the rock. So not only barnacles are crowding the rock, but Mussels as well are crowding the rock.
I believe the answer is A. True! Good luck with the respond your homework! Anymore questions you can just comment or DM me:)
Analogous. This means they share a similar function (flight) but do not have the same embryonic origin.
Sexual Reproduction. Meiosis can be pronounced (MIosis) but for the purposes of not getting it confuses me Mitosis, I pronounce it (MEosis), and the way I remember it is, (MEosis) is use for sexual REprodection, to make gamETES. Hope it helped! :)