I think A because males have XY and females have XX but don’t count on it
If it killed the top level of an ecosystem it would damage the whole ecosystem because it's connected. An organism depends on that top organism which would mean that is that organism dies it would affect the organism that depends on it.
Depends on what you have to watch stuff on, make sure you check reviews of movies to see how good they are. I’m currently watching attack on titan, but I really enjoy studio ghibli movies, they are on HBO Max and other places
A group of tissue that work together is a organ
Just as they do in most ecosystems, decomposers feed off of dead or decaying matter, recycling it back into the ecosystem for plants to receive essential nutrients and to.. basically, de-clutter the world.