Asexual is where you dont need a partner and can reproduce on your own and sexually is when you need to partners to reproduce.
Hope this helps
There are some things that can prevent decay, one if them is ice, an example of that is a frozen mammoth, ice can prevent the body from decaying, another thing is amber, it can trap an insect and prevent it from decaying, lastly there is tar, a substance that covers thing in a black substance that prevents it from decaying.