Which sample contained the universal donor? which sample contained the universal recipient?

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells

What is the difference between how ionic and covalent bonds form

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.